diff --git a/lib/accesslib.php b/lib/accesslib.php
index 52c480d8fa5..fd01b6c82eb 100755
--- a/lib/accesslib.php
+++ b/lib/accesslib.php
@@ -191,16 +191,16 @@ if (!defined('MAX_CONTEXT_CACHE_SIZE')) {
  * @name $ACCESSLIB_PRIVATE
  */
 global $ACCESSLIB_PRIVATE;
-$ACCESSLIB_PRIVATE = new stdClass;
-$ACCESSLIB_PRIVATE->contexts = array(); // Cache of context objects by level and instance
-$ACCESSLIB_PRIVATE->contextsbyid = array(); // Cache of context objects by id
-$ACCESSLIB_PRIVATE->systemcontext = NULL; // Used in get_system_context
-$ACCESSLIB_PRIVATE->dirtycontexts = NULL; // Dirty contexts cache
+$ACCESSLIB_PRIVATE = new stdClass();
+$ACCESSLIB_PRIVATE->contexts         = array(); // Cache of context objects by level and instance
+$ACCESSLIB_PRIVATE->contextsbyid     = array(); // Cache of context objects by id
+$ACCESSLIB_PRIVATE->systemcontext    = null; // Used in get_system_context
+$ACCESSLIB_PRIVATE->dirtycontexts    = null; // Dirty contexts cache
 $ACCESSLIB_PRIVATE->accessdatabyuser = array(); // Holds the $accessdata structure for users other than $USER
-$ACCESSLIB_PRIVATE->roledefinitions = array(); // role definitions cache - helps a lot with mem usage in cron
-$ACCESSLIB_PRIVATE->croncache = array(); // Used in get_role_access
+$ACCESSLIB_PRIVATE->roledefinitions  = array(); // role definitions cache - helps a lot with mem usage in cron
+$ACCESSLIB_PRIVATE->croncache        = array(); // Used in get_role_access
 $ACCESSLIB_PRIVATE->preloadedcourses = array(); // Used in preload_course_contexts.
-$ACCESSLIB_PRIVATE->capabilities = NULL; // detailed information about the capabilities
+$ACCESSLIB_PRIVATE->capabilities     = null; // detailed information about the capabilities
 
 /**
  * Clears accesslib's private caches. ONLY BE USED BY UNIT TESTS
@@ -208,32 +208,30 @@ $ACCESSLIB_PRIVATE->capabilities = NULL; // detailed information about the capab
  * This method should ONLY BE USED BY UNIT TESTS. It clears all of
  * accesslib's private caches. You need to do this before setting up test data,
  * and also at the end of the tests.
- * @global object
- * @global object
- * @global object
  */
 function accesslib_clear_all_caches_for_unit_testing() {
     global $UNITTEST, $USER, $ACCESSLIB_PRIVATE;
     if (empty($UNITTEST->running)) {
         throw new coding_exception('You must not call clear_all_caches outside of unit tests.');
     }
-    $ACCESSLIB_PRIVATE->contexts = array();
-    $ACCESSLIB_PRIVATE->contextsbyid = array();
-    $ACCESSLIB_PRIVATE->systemcontext = NULL;
-    $ACCESSLIB_PRIVATE->dirtycontexts = NULL;
+    $ACCESSLIB_PRIVATE->contexts         = array();
+    $ACCESSLIB_PRIVATE->contextsbyid     = array();
+    $ACCESSLIB_PRIVATE->systemcontext    = null;
+    $ACCESSLIB_PRIVATE->dirtycontexts    = null;
     $ACCESSLIB_PRIVATE->accessdatabyuser = array();
-    $ACCESSLIB_PRIVATE->roledefinitions = array();
-    $ACCESSLIB_PRIVATE->croncache = array();
+    $ACCESSLIB_PRIVATE->roledefinitions  = array();
+    $ACCESSLIB_PRIVATE->croncache        = array();
     $ACCESSLIB_PRIVATE->preloadedcourses = array();
-    $ACCESSLIB_PRIVATE->capabilities = NULL;
+    $ACCESSLIB_PRIVATE->capabilities     = null;
 
     unset($USER->access);
 }
 
 /**
  * Private function. Add a context object to accesslib's caches.
- * @global object
+ *
  * @param object $context
+ * @return void
  */
 function cache_context($context) {
     global $ACCESSLIB_PRIVATE;
@@ -253,7 +251,6 @@ function cache_context($context) {
 /**
  * This is really slow!!! do not use above course context level
  *
- * @global object
  * @param int $roleid
  * @param object $context
  * @return array
@@ -298,14 +295,11 @@ function get_role_context_caps($roleid, $context) {
 /**
  * Gets the accessdata for role "sitewide" (system down to course)
  *
- * @global object
- * @global object
  * @param int $roleid
- * @param array $accessdata defaults to NULL
+ * @param array $accessdata defaults to null
  * @return array
  */
-function get_role_access($roleid, $accessdata=NULL) {
-
+function get_role_access($roleid, $accessdata = null) {
     global $CFG, $DB;
 
     /* Get it in 1 cheap DB query...
@@ -369,13 +363,11 @@ function get_role_access($roleid, $accessdata=NULL) {
 /**
  * Gets the accessdata for role "sitewide" (system down to course)
  *
- * @global object
- * @global object
  * @param int $roleid
- * @param array $accessdata defaults to NULL
+ * @param array $accessdata defaults to null
  * @return array
  */
-function get_default_frontpage_role_access($roleid, $accessdata=NULL) {
+function get_default_frontpage_role_access($roleid, $accessdata = null) {
 
     global $CFG, $DB;
 
@@ -412,9 +404,7 @@ function get_default_frontpage_role_access($roleid, $accessdata=NULL) {
 /**
  * Get the default guest role
  *
- * @global object
- * @global object
- * @return object role
+ * @return stdClass role
  */
 function get_guest_role() {
     global $CFG, $DB;
@@ -454,11 +444,11 @@ function get_guest_role() {
  *
  * @param string $capability the name of the capability to check. For example mod/forum:view
  * @param object $context the context to check the capability in. You normally get this with {@link get_context_instance}.
- * @param integer|object $user A user id or object. By default (NULL) checks the permissions of the current user.
+ * @param integer|object $user A user id or object. By default (null) checks the permissions of the current user.
  * @param boolean $doanything If false, ignores effect of admin role assignment
  * @return boolean true if the user has this capability. Otherwise false.
  */
-function has_capability($capability, $context, $user = NULL, $doanything=true) {
+function has_capability($capability, $context, $user = null, $doanything = true) {
     global $USER, $CFG, $DB, $SCRIPT, $ACCESSLIB_PRIVATE;
 
     if (during_initial_install()) {
@@ -485,7 +475,7 @@ function has_capability($capability, $context, $user = NULL, $doanything=true) {
     }
 
     // make sure there is a real user specified
-    if ($user === NULL) {
+    if ($user === null) {
         $userid = !empty($USER->id) ? $USER->id : 0;
     } else {
         $userid = !empty($user->id) ? $user->id : $user;
@@ -518,7 +508,7 @@ function has_capability($capability, $context, $user = NULL, $doanything=true) {
         // In cron, some modules setup a 'fake' $USER,
         // ensure we load the appropriate accessdata.
         if (isset($ACCESSLIB_PRIVATE->accessdatabyuser[$userid])) {
-            $ACCESSLIB_PRIVATE->dirtycontexts = NULL; //load fresh dirty contexts
+            $ACCESSLIB_PRIVATE->dirtycontexts = null; //load fresh dirty contexts
         } else {
             load_user_accessdata($userid);
             $ACCESSLIB_PRIVATE->dirtycontexts = array();
@@ -647,11 +637,11 @@ function has_capability($capability, $context, $user = NULL, $doanything=true) {
  * @see has_capability()
  * @param array $capabilities an array of capability names.
  * @param object $context the context to check the capability in. You normally get this with {@link get_context_instance}.
- * @param integer $userid A user id. By default (NULL) checks the permissions of the current user.
+ * @param integer $userid A user id. By default (null) checks the permissions of the current user.
  * @param boolean $doanything If false, ignore effect of admin role assignment
  * @return boolean true if the user has any of these capabilities. Otherwise false.
  */
-function has_any_capability($capabilities, $context, $userid=NULL, $doanything=true) {
+function has_any_capability($capabilities, $context, $userid = null, $doanything = true) {
     if (!is_array($capabilities)) {
         debugging('Incorrect $capabilities parameter in has_any_capabilities() call - must be an array');
         return false;
@@ -677,11 +667,11 @@ function has_any_capability($capabilities, $context, $userid=NULL, $doanything=t
  * @see has_capability()
  * @param array $capabilities an array of capability names.
  * @param object $context the context to check the capability in. You normally get this with {@link get_context_instance}.
- * @param integer $userid A user id. By default (NULL) checks the permissions of the current user.
+ * @param integer $userid A user id. By default (null) checks the permissions of the current user.
  * @param boolean $doanything If false, ignore effect of admin role assignment
  * @return boolean true if the user has all of these capabilities. Otherwise false.
  */
-function has_all_capabilities($capabilities, $context, $userid=NULL, $doanything=true) {
+function has_all_capabilities($capabilities, $context, $userid = null, $doanything = true) {
     if (!is_array($capabilities)) {
         debugging('Incorrect $capabilities parameter in has_all_capabilities() call - must be an array');
         return false;
@@ -703,10 +693,10 @@ function has_all_capabilities($capabilities, $context, $userid=NULL, $doanything
  * @param   int|object  $user_or_id user id or user object
  * @returns bool true if user is one of the administrators, false otherwise
  */
-function is_siteadmin($user_or_id = NULL) {
+function is_siteadmin($user_or_id = null) {
     global $CFG, $USER;
 
-    if ($user_or_id === NULL) {
+    if ($user_or_id === null) {
         $user_or_id = $USER;
     }
 
@@ -727,8 +717,9 @@ function is_siteadmin($user_or_id = NULL) {
 /**
  * Returns true if user has at least one role assign
  * of 'coursecontact' role (is potentially listed in some course descriptions).
+ *
  * @param $userid
- * @return unknown_type
+ * @return stdClass
  */
 function has_coursecontact_role($userid) {
     global $DB, $CFG;
@@ -847,7 +838,7 @@ function has_capability_in_accessdata($capability, $context, array $accessdata)
         foreach ($paths as $path) {
             if (isset($accessdata['rsw'][$path])) {
                 // Found a switchrole assignment - check for that role _plus_ the default user role
-                $roles = array($accessdata['rsw'][$path]=>NULL, $CFG->defaultuserroleid=>NULL);
+                $roles = array($accessdata['rsw'][$path]=>null, $CFG->defaultuserroleid=>null);
                 $switchedrole = true;
                 break;
             }
@@ -859,7 +850,7 @@ function has_capability_in_accessdata($capability, $context, array $accessdata)
         foreach ($paths as $path) {
             if (isset($accessdata['ra'][$path])) {
                 foreach ($accessdata['ra'][$path] as $roleid) {
-                    $roles[$roleid] = NULL;
+                    $roles[$roleid] = null;
                 }
             }
         }
@@ -906,7 +897,7 @@ function aggregate_roles_from_accessdata($context, $accessdata) {
 
     $roles = array();
     // From the bottom up...
-    for ($n=$cc-1;$n>=0;$n--) {
+    for ($n=$cc-1; $n>=0; $n--) {
         $ctxp = $contexts[$n];
         if (isset($accessdata['ra'][$ctxp]) && count($accessdata['ra'][$ctxp])) {
             // Found assignments on this leaf
@@ -931,13 +922,13 @@ function aggregate_roles_from_accessdata($context, $accessdata) {
  *
  * @param string $capability the name of the capability to check. For example mod/forum:view
  * @param object $context the context to check the capability in. You normally get this with {@link get_context_instance}.
- * @param integer $userid A user id. By default (NULL) checks the permissions of the current user.
+ * @param integer $userid A user id. By default (null) checks the permissions of the current user.
  * @param bool $doanything If false, ignore effect of admin role assignment
  * @param string $errorstring The error string to to user. Defaults to 'nopermissions'.
  * @param string $stringfile The language file to load the error string from. Defaults to 'error'.
  * @return void terminates with an error if the user does not have the given capability.
  */
-function require_capability($capability, $context, $userid = NULL, $doanything = true,
+function require_capability($capability, $context, $userid = null, $doanything = true,
                             $errormessage = 'nopermissions', $stringfile = '') {
     if (!has_capability($capability, $context, $userid, $doanything)) {
         throw new required_capability_exception($context, $capability, $errormessage, $stringfile);
@@ -956,7 +947,7 @@ function require_capability($capability, $context, $userid = NULL, $doanything =
  * @param int    $limit_ignored
  * @return array $courses - ordered array of course objects - see notes above
  */
-function get_user_courses_bycap($userid, $cap, $accessdata_ignored, $doanything_ignored, $sort='c.sortorder ASC', $fields=NULL, $limit_ignored=0) {
+function get_user_courses_bycap($userid, $cap, $accessdata_ignored, $doanything_ignored, $sort = 'c.sortorder ASC', $fields = null, $limit_ignored = 0) {
 
     //TODO: this should be most probably deprecated
 
@@ -984,12 +975,10 @@ function get_user_courses_bycap($userid, $cap, $accessdata_ignored, $doanything_
  * [rdef] => [/path/:roleid][capability]=permission
  * [loaded] => array('/path', '/path')
  *
- * @global object
- * @global object
- * @param $userid integer - the id of the user
+ * @param int $userid - the id of the user
+ * @return array
  */
 function get_user_access_sitewide($userid) {
-
     global $CFG, $DB;
 
     /* Get in 3 cheap DB queries...
@@ -999,7 +988,7 @@ function get_user_access_sitewide($userid) {
      *   - below this user's RAs - limited to course level
      */
 
-    $accessdata           = array(); // named list
+    $accessdata = array(); // named list
     $accessdata['ra']     = array();
     $accessdata['rdef']   = array();
     $accessdata['loaded'] = array();
@@ -1063,10 +1052,9 @@ function get_user_access_sitewide($userid) {
 
     if ($clauses !== '') {
         $sql = "SELECT ctx.path, rc.roleid, rc.capability, rc.permission
-                FROM {role_capabilities} rc
-                JOIN {context} ctx
-                  ON rc.contextid=ctx.id
-                WHERE $clauses";
+                  FROM {role_capabilities} rc
+                  JOIN {context} ctx ON rc.contextid=ctx.id
+                 WHERE $clauses";
 
         unset($clauses);
         $rs = $DB->get_recordset_sql($sql, $cparams);
@@ -1100,8 +1088,8 @@ function get_user_access_sitewide($userid) {
               JOIN {role_capabilities} rco
                    ON (rco.roleid=ra.roleid AND rco.contextid=sctx.id)
              WHERE ra.userid = ?
-               AND ctx.contextlevel <= ".CONTEXT_COURSECAT."
-               AND sctx.contextlevel <= ".CONTEXT_COURSE."
+                   AND ctx.contextlevel <= ".CONTEXT_COURSECAT."
+                   AND sctx.contextlevel <= ".CONTEXT_COURSE."
           ORDER BY sctx.depth, sctx.path, ra.roleid";
     $params = array($userid);
     $rs = $DB->get_recordset_sql($sql, $params);
@@ -1119,14 +1107,12 @@ function get_user_access_sitewide($userid) {
 /**
  * Add to the access ctrl array the data needed by a user for a given context
  *
- * @global object
- * @global object
  * @param integer $userid the id of the user
  * @param object $context needs path!
  * @param array $accessdata accessdata array
+ * @return void
  */
 function load_subcontext($userid, $context, &$accessdata) {
-
     global $CFG, $DB;
 
     /* Get the additional RAs and relevant rolecaps
@@ -1268,15 +1254,12 @@ function load_subcontext($userid, $context, &$accessdata) {
  * and to get an overview of what a role gets under a
  * given context and below...
  *
- * @global object
- * @global object
  * @param integer $roleid the id of the user
  * @param object $context needs path!
- * @param array $accessdata accessdata array NULL by default
+ * @param array $accessdata accessdata array null by default
  * @return array
  */
-function get_role_access_bycontext($roleid, $context, $accessdata=NULL) {
-
+function get_role_access_bycontext($roleid, $context, $accessdata = null) {
     global $CFG, $DB;
 
     /* Get the relevant rolecaps into rdef
@@ -1332,8 +1315,6 @@ function get_role_access_bycontext($roleid, $context, $accessdata=NULL) {
  * to call it if you are about to run a BIG
  * cron run across a bazillion users.
  *
- * @global object
- * @global object
  * @param int $userid
  * @return array returns ACCESSLIB_PRIVATE->accessdatabyuser[userid]
  */
@@ -1381,7 +1362,6 @@ function load_user_accessdata($userid) {
 /**
  * Use shared copy of role definitions stored in ACCESSLIB_PRIVATE->roledefinitions;
  *
- * @global object
  * @param array $rdefs array of role definitions in contexts
  */
 function compact_rdefs(&$rdefs) {
@@ -1408,9 +1388,7 @@ function compact_rdefs(&$rdefs) {
  * check_enrolment_plugins();
  * @see check_enrolment_plugins()
  *
- * @global object
- * @global object
- * @global object
+ * @return void
  */
 function load_all_capabilities() {
     global $CFG, $ACCESSLIB_PRIVATE;
@@ -1488,8 +1466,7 @@ function load_all_capabilities() {
  *
  * Note: rewrites $USER->access completely.
  *
- * @global object
- * @global object
+ * @return void
  */
 function reload_all_capabilities() {
     global $USER, $DB;
@@ -1681,8 +1658,7 @@ function is_safe_capability($capability) {
  * @param int $strictness
  * @return object newly created context
  */
-function create_context($contextlevel, $instanceid, $strictness=IGNORE_MISSING) {
-
+function create_context($contextlevel, $instanceid, $strictness = IGNORE_MISSING) {
     global $CFG, $DB;
 
     if ($contextlevel == CONTEXT_SYSTEM) {
@@ -1699,7 +1675,7 @@ function create_context($contextlevel, $instanceid, $strictness=IGNORE_MISSING)
     $basedepth = 1;
 
     $result = true;
-    $error_message = NULL;
+    $error_message = null;
 
     switch ($contextlevel) {
         case CONTEXT_COURSECAT:
@@ -1720,7 +1696,7 @@ function create_context($contextlevel, $instanceid, $strictness=IGNORE_MISSING)
                     $basedepth = $parent->depth;
                 } else {
                     // wrong parent category - no big deal, this can be fixed later
-                    $basepath  = NULL;
+                    $basepath  = null;
                     $basedepth = 0;
                 }
             } else {
@@ -1748,7 +1724,7 @@ function create_context($contextlevel, $instanceid, $strictness=IGNORE_MISSING)
                     $basedepth = $parent->depth;
                 } else {
                     // wrong parent category of course - no big deal, this can be fixed later
-                    $basepath  = NULL;
+                    $basepath  = null;
                     $basedepth = 0;
                 }
             } else if ($instanceid == SITEID) {
@@ -1829,17 +1805,12 @@ function create_context($contextlevel, $instanceid, $strictness=IGNORE_MISSING)
 }
 
 /**
- * Returns system context or NULL if can not be created yet.
+ * Returns system context or null if can not be created yet.
  *
- * @todo can not use get_record() because we do not know if query failed :-(
- * switch to get_record() later
- *
- * @global object
- * @global object
  * @param bool $cache use caching
- * @return mixed system context or NULL
+ * @return mixed system context or null
  */
-function get_system_context($cache=true) {
+function get_system_context($cache = true) {
     global $DB, $ACCESSLIB_PRIVATE;
     if ($cache and defined('SYSCONTEXTID')) {
         if (is_null($ACCESSLIB_PRIVATE->systemcontext)) {
@@ -1856,7 +1827,7 @@ function get_system_context($cache=true) {
         $context = $DB->get_record('context', array('contextlevel'=>CONTEXT_SYSTEM));
     } catch (dml_exception $e) {
         //table does not exist yet, sorry
-        return NULL;
+        return null;
     }
 
     if (!$context) {
@@ -1864,13 +1835,13 @@ function get_system_context($cache=true) {
         $context->contextlevel = CONTEXT_SYSTEM;
         $context->instanceid   = 0;
         $context->depth        = 1;
-        $context->path         = NULL; //not known before insert
+        $context->path         = null; //not known before insert
 
         try {
             $context->id = $DB->insert_record('context', $context);
         } catch (dml_exception $e) {
             // can not create context yet, sorry
-            return NULL;
+            return null;
         }
     }
 
@@ -1947,12 +1918,11 @@ function delete_context($contextlevel, $instanceid, $deleterecord = true) {
 /**
  * Precreates all contexts including all parents
  *
- * @global object
  * @param int $contextlevel empty means all
  * @param bool $buildpaths update paths and depths
  * @return void
  */
-function create_contexts($contextlevel=NULL, $buildpaths=true) {
+function create_contexts($contextlevel = null, $buildpaths = true) {
     global $DB;
 
     //make sure system context exists
@@ -2027,7 +1997,6 @@ function create_contexts($contextlevel=NULL, $buildpaths=true) {
 /**
  * Remove stale context records
  *
- * @global object
  * @return bool
  */
 function cleanup_contexts() {
@@ -2133,8 +2102,7 @@ function preload_course_contexts($courseid) {
  *      MUST_EXIST means throw exception if no record or multiple records found
  * @return object The context object.
  */
-function get_context_instance($contextlevel, $instance=0, $strictness=IGNORE_MISSING) {
-
+function get_context_instance($contextlevel, $instance = 0, $strictness = IGNORE_MISSING) {
     global $DB, $ACCESSLIB_PRIVATE;
     static $allowed_contexts = array(CONTEXT_SYSTEM, CONTEXT_USER, CONTEXT_COURSECAT, CONTEXT_COURSE, CONTEXT_MODULE, CONTEXT_BLOCK);
 
@@ -2215,12 +2183,12 @@ function get_context_instance($contextlevel, $instance=0, $strictness=IGNORE_MIS
 /**
  * Get a context instance as an object, from a given context id.
  *
- * @param mixed $id a context id or array of ids.
+ * @param int $id context id
  * @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
  *                        MUST_EXIST means throw exception if no record or multiple records found
- * @return mixed object, array of the context object, or false.
+ * @return stdClass|bool the context object or false if not found.
  */
-function get_context_instance_by_id($id, $strictness=IGNORE_MISSING) {
+function get_context_instance_by_id($id, $strictness = IGNORE_MISSING) {
     global $DB, $ACCESSLIB_PRIVATE;
 
     if ($id == SYSCONTEXTID) {
@@ -2243,7 +2211,6 @@ function get_context_instance_by_id($id, $strictness=IGNORE_MISSING) {
 /**
  * Get the local override (if any) for a given capability in a role in a context
  *
- * @global object
  * @param int $roleid
  * @param int $contextid
  * @param string $capability
@@ -2262,8 +2229,8 @@ function get_context_info_array($contextid) {
     global $DB;
 
     $context = get_context_instance_by_id($contextid, MUST_EXIST);
-    $course  = NULL;
-    $cm      = NULL;
+    $course  = null;
+    $cm      = null;
 
     if ($context->contextlevel == CONTEXT_COURSE) {
         $course = $DB->get_record('course', array('id'=>$context->instanceid), '*', MUST_EXIST);
@@ -2326,14 +2293,13 @@ function get_courseid_from_context($context) {
 /**
  * function that creates a role
  *
- * @global object
  * @param string $name role name
  * @param string $shortname role short name
  * @param string $description role description
  * @param string $archetype
- * @return mixed id or dml_exception
+ * @return int id or dml_exception
  */
-function create_role($name, $shortname, $description, $archetype='') {
+function create_role($name, $shortname, $description, $archetype = '') {
     global $DB;
 
     if (strpos($archetype, 'moodle/legacy:') !== false) {
@@ -2401,16 +2367,14 @@ function delete_role($roleid) {
 /**
  * Function to write context specific overrides, or default capabilities.
  *
- * @global object
- * @global object
- * @param string module string name
- * @param string capability string name
- * @param int contextid context id
- * @param int roleid role id
- * @param int permission int 1,-1 or -1000 should not be writing if permission is 0
- * @return bool
+ * @param string $capability string name
+ * @param int $permission CAP_ constants
+ * @param int $roleid role id
+ * @param int $contextid context id
+ * @param bool $overwrite
+ * @return bool always true or exception
  */
-function assign_capability($capability, $permission, $roleid, $contextid, $overwrite=false) {
+function assign_capability($capability, $permission, $roleid, $contextid, $overwrite = false) {
     global $USER, $DB;
 
     if (empty($permission) || $permission == CAP_INHERIT) { // if permission is not set
@@ -2425,12 +2389,12 @@ function assign_capability($capability, $permission, $roleid, $contextid, $overw
     }
 
     $cap = new stdClass();
-    $cap->contextid = $contextid;
-    $cap->roleid = $roleid;
-    $cap->capability = $capability;
-    $cap->permission = $permission;
+    $cap->contextid    = $contextid;
+    $cap->roleid       = $roleid;
+    $cap->capability   = $capability;
+    $cap->permission   = $permission;
     $cap->timemodified = time();
-    $cap->modifierid = empty($USER->id) ? 0 : $USER->id;
+    $cap->modifierid   = empty($USER->id) ? 0 : $USER->id;
 
     if ($existing) {
         $cap->id = $existing->id;
@@ -2445,12 +2409,12 @@ function assign_capability($capability, $permission, $roleid, $contextid, $overw
 /**
  * Unassign a capability from a role.
  *
- * @global object
- * @param int $roleid the role id
  * @param string $capability the name of the capability
+ * @param int $roleid the role id
+ * @param int $contextid null means all contexts
  * @return boolean success or failure
  */
-function unassign_capability($capability, $roleid, $contextid=NULL) {
+function unassign_capability($capability, $roleid, $contextid = null) {
     global $DB;
 
     if (!empty($contextid)) {
@@ -2644,7 +2608,7 @@ function role_unassign($roleid, $userid, $contextid, $component = '', $itemid =
  * @param bool $includmanual include manual role assignments too
  * @return void
  */
-function role_unassign_all(array $params, $subcontexts = false, $includemanual=false) {
+function role_unassign_all(array $params, $subcontexts = false, $includemanual = false) {
     global $USER, $CFG, $DB;
 
     if (!$params) {
@@ -2734,7 +2698,7 @@ function isloggedin() {
  * @param int|object $user mixed user object or id, $USER if not specified
  * @return bool true if user is the real guest user, false if not logged in or other user
  */
-function isguestuser($user = NULL) {
+function isguestuser($user = null) {
     global $USER, $DB, $CFG;
 
     // make sure we have the user id cached in config table, because we are going to use it a lot
@@ -2745,11 +2709,11 @@ function isguestuser($user = NULL) {
         }
         set_config('siteguest', $guestid);
     }
-    if ($user === NULL) {
+    if ($user === null) {
         $user = $USER;
     }
 
-    if ($user === NULL) {
+    if ($user === null) {
         // happens when setting the $USER
         return false;
 
@@ -2771,18 +2735,18 @@ function isguestuser($user = NULL) {
 /**
  * Does user have a (temporary or real) guest access to course?
  *
- * @param object $context
- * @param object|int $user
+ * @param stdClass $context
+ * @param stdClass|int $user
  * @return bool
  */
-function is_guest($context, $user = NULL) {
+function is_guest($context, $user = null) {
     global $USER;
 
     // first find the course context
     $coursecontext = get_course_context($context);
 
     // make sure there is a real user specified
-    if ($user === NULL) {
+    if ($user === null) {
         $userid = !empty($USER->id) ? $USER->id : 0;
     } else {
         $userid = !empty($user->id) ? $user->id : $user;
@@ -2811,14 +2775,12 @@ function is_guest($context, $user = NULL) {
  * Returns true if the user has moodle/course:view capability in the course,
  * this is intended for admins, managers (aka small admins), inspectors, etc.
  *
- * @param object $context
- * @param int|object $user, if NULL $USER is used
+ * @param stdClass $context
+ * @param int|object $user, if null $USER is used
  * @param string $withcapability extra capability name
  * @return bool
  */
-function is_viewing($context, $user = NULL, $withcapability = '') {
-    global $USER;
-
+function is_viewing($context, $user = null, $withcapability = '') {
     // first find the course context
     $coursecontext = get_course_context($context);
 
@@ -2845,19 +2807,19 @@ function is_viewing($context, $user = NULL, $withcapability = '') {
  * this is intended for students and teachers.
  *
  * @param object $context
- * @param int|object $user, if NULL $USER is used, otherwise user object or id expected
+ * @param int|object $user, if null $USER is used, otherwise user object or id expected
  * @param string $withcapability extra capability name
  * @param bool $onlyactive consider only active enrolments in enabled plugins and time restrictions
  * @return bool
  */
-function is_enrolled($context, $user = NULL, $withcapability = '', $onlyactive = false) {
+function is_enrolled($context, $user = null, $withcapability = '', $onlyactive = false) {
     global $USER, $DB;
 
     // first find the course context
     $coursecontext = get_course_context($context);
 
     // make sure there is a real user specified
-    if ($user === NULL) {
+    if ($user === null) {
         $userid = !empty($USER->id) ? $USER->id : 0;
     } else {
         $userid = !empty($user->id) ? $user->id : $user;
@@ -2999,8 +2961,8 @@ function get_enrolled_sql($context, $withcapability = '', $groupid = 0, $onlyact
             }
         }
 
-        $defaultuserroleid      = isset($CFG->defaultuserroleid) ? $CFG->defaultuserroleid : NULL;
-        $defaultfrontpageroleid = isset($CFG->defaultfrontpageroleid) ? $CFG->defaultfrontpageroleid : NULL;
+        $defaultuserroleid      = isset($CFG->defaultuserroleid) ? $CFG->defaultuserroleid : null;
+        $defaultfrontpageroleid = isset($CFG->defaultfrontpageroleid) ? $CFG->defaultfrontpageroleid : null;
 
         $nobody = false;
 
@@ -3142,7 +3104,6 @@ function count_enrolled_users($context, $withcapability = '', $groupid = 0) {
  * Loads the capability definitions for the component (from file). If no
  * capabilities are defined for the component, we simply return an empty array.
  *
- * @global object
  * @param string $component full plugin name, examples: 'moodle', 'mod_forum'
  * @return array array of capabilities
  */
@@ -3169,7 +3130,7 @@ function load_capability_def($component) {
  * @param string $component - examples: 'moodle', 'mod_forum'
  * @return array array of capabilities
  */
-function get_cached_capabilities($component='moodle') {
+function get_cached_capabilities($component = 'moodle') {
     global $DB;
     return $DB->get_records('capabilities', array('component'=>$component));
 }
@@ -3218,6 +3179,7 @@ function get_default_capabilities($archetype) {
  * Reset role capabilities to default according to selected role archetype.
  * If no archetype selected, removes all capabilities.
  * @param int $roleid
+ * @return void
  */
 function reset_role_capabilities($roleid) {
     global $DB;
@@ -3243,11 +3205,10 @@ function reset_role_capabilities($roleid) {
  * will cause any stored capabilities for the component to be removed from
  * the database.
  *
- * @global object
  * @param string $component examples: 'moodle', 'mod/forum', 'block/quiz_results'
  * @return boolean true if success, exception in case of any problems
  */
-function update_capabilities($component='moodle') {
+function update_capabilities($component = 'moodle') {
     global $DB, $OUTPUT, $ACCESSLIB_PRIVATE;
 
     $storedcaps = array();
@@ -3303,11 +3264,11 @@ function update_capabilities($component='moodle') {
     // Add new capabilities to the stored definition.
     foreach ($newcaps as $capname => $capdef) {
         $capability = new stdClass();
-        $capability->name = $capname;
-        $capability->captype = $capdef['captype'];
+        $capability->name         = $capname;
+        $capability->captype      = $capdef['captype'];
         $capability->contextlevel = $capdef['contextlevel'];
-        $capability->component = $component;
-        $capability->riskbitmask = $capdef['riskbitmask'];
+        $capability->component    = $component;
+        $capability->riskbitmask  = $capdef['riskbitmask'];
 
         $DB->insert_record('capabilities', $capability, false);
 
@@ -3335,7 +3296,7 @@ function update_capabilities($component='moodle') {
     capabilities_cleanup($component, $filecaps);
 
     // reset static caches
-    $ACCESSLIB_PRIVATE->capabilities = NULL;
+    $ACCESSLIB_PRIVATE->capabilities = null;
 
     return true;
 }
@@ -3345,13 +3306,12 @@ function update_capabilities($component='moodle') {
  * Deletes cached capabilities that are no longer needed by the component.
  * Also unassigns these capabilities from any roles that have them.
  *
- * @global object
- * @param string $component examples: 'moodle', 'mod/forum', 'block/quiz_results'
+ * @param string $component examples: 'moodle', 'mod_forum', 'block_quiz_results'
  * @param array $newcapdef array of the new capability definitions that will be
  *                     compared with the cached capabilities
  * @return int number of deprecated capabilities that have been removed
  */
-function capabilities_cleanup($component, $newcapdef=NULL) {
+function capabilities_cleanup($component, $newcapdef = null) {
     global $DB;
 
     $removedcount = 0;
@@ -3389,15 +3349,15 @@ function capabilities_cleanup($component, $newcapdef=NULL) {
  * @return string the name for this type of context.
  */
 function get_contextlevel_name($contextlevel) {
-    static $strcontextlevels = NULL;
+    static $strcontextlevels = null;
     if (is_null($strcontextlevels)) {
         $strcontextlevels = array(
-            CONTEXT_SYSTEM => get_string('coresystem'),
-            CONTEXT_USER => get_string('user'),
+            CONTEXT_SYSTEM    => get_string('coresystem'),
+            CONTEXT_USER      => get_string('user'),
             CONTEXT_COURSECAT => get_string('category'),
-            CONTEXT_COURSE => get_string('course'),
-            CONTEXT_MODULE => get_string('activitymodule'),
-            CONTEXT_BLOCK => get_string('block')
+            CONTEXT_COURSE    => get_string('course'),
+            CONTEXT_MODULE    => get_string('activitymodule'),
+            CONTEXT_BLOCK     => get_string('block')
         );
     }
     return $strcontextlevels[$contextlevel];
@@ -3406,7 +3366,6 @@ function get_contextlevel_name($contextlevel) {
 /**
  * Prints human readable context identifier.
  *
- * @global object
  * @param object $context the context.
  * @param boolean $withprefix whether to prefix the name of the context with the
  *      type of context, e.g. User, Course, Forum, etc.
@@ -3550,18 +3509,17 @@ function get_context_url($context) {
 function get_all_risks() {
     return array(
         'riskmanagetrust' => RISK_MANAGETRUST,
-        'riskconfig' => RISK_CONFIG,
-        'riskxss' => RISK_XSS,
-        'riskpersonal' => RISK_PERSONAL,
-        'riskspam' => RISK_SPAM,
-        'riskdataloss' => RISK_DATALOSS,
+        'riskconfig'      => RISK_CONFIG,
+        'riskxss'         => RISK_XSS,
+        'riskpersonal'    => RISK_PERSONAL,
+        'riskspam'        => RISK_SPAM,
+        'riskdataloss'    => RISK_DATALOSS,
     );
 }
 
 /**
  * Return a link to moodle docs for a given capability name
  *
- * @global object
  * @param object $capability a capability - a row from the mdl_capabilities table.
  * @return string the human-readable capability name as a link to Moodle Docs.
  */
@@ -3583,8 +3541,6 @@ function get_capability_docs_link($capability) {
  * `contextlevel` int(10) NOT NULL,
  * `component` varchar(100) NOT NULL,
  *
- * @global object
- * @global object
  * @param object context
  * @return array
  */
@@ -3635,7 +3591,7 @@ function fetch_context_capabilities($context) {
                     $extracaps = $modfunction();
                 }
             }
-            if(empty($extracaps)) {
+            if (empty($extracaps)) {
                 $extracaps = array();
             }
 
@@ -3690,14 +3646,12 @@ function fetch_context_capabilities($context) {
  * defaults) of a role used in capability overrides in contexts at a given
  * context.
  *
- * @global object
  * @param obj $context
  * @param int $roleid
  * @param string $cap capability, optional, defaults to ''
- * @param bool if set to true, resolve till this level, else stop at immediate parent level
- * @return array
+ * @return array of capabilities
  */
-function role_context_capabilities($roleid, $context, $cap='') {
+function role_context_capabilities($roleid, $context, $cap = '') {
     global $DB;
 
     $contexts = get_parent_contexts($context);
@@ -3841,7 +3795,6 @@ function is_inside_frontpage($context) {
  * for the purpose of $select, you need to know that the context table has been
  * aliased to ctx, so for example, you can call get_sorted_contexts('ctx.depth = 3');
  *
- * @global object
  * @param string $select the contents of the WHERE clause. Remember to do ctx.fieldname.
  * @param array $params any parameters required by $select.
  * @return array the requested context records.
@@ -3853,14 +3806,14 @@ function get_sorted_contexts($select, $params = array()) {
     }
     return $DB->get_records_sql("
             SELECT ctx.*
-            FROM {context} ctx
-            LEFT JOIN {user} u ON ctx.contextlevel = " . CONTEXT_USER . " AND u.id = ctx.instanceid
-            LEFT JOIN {course_categories} cat ON ctx.contextlevel = " . CONTEXT_COURSECAT . " AND cat.id = ctx.instanceid
-            LEFT JOIN {course} c ON ctx.contextlevel = " . CONTEXT_COURSE . " AND c.id = ctx.instanceid
-            LEFT JOIN {course_modules} cm ON ctx.contextlevel = " . CONTEXT_MODULE . " AND cm.id = ctx.instanceid
-            LEFT JOIN {block_instances} bi ON ctx.contextlevel = " . CONTEXT_BLOCK . " AND bi.id = ctx.instanceid
-            $select
-            ORDER BY ctx.contextlevel, bi.defaultregion, COALESCE(cat.sortorder, c.sortorder, cm.section, bi.defaultweight), u.lastname, u.firstname, cm.id
+              FROM {context} ctx
+              LEFT JOIN {user} u ON ctx.contextlevel = " . CONTEXT_USER . " AND u.id = ctx.instanceid
+              LEFT JOIN {course_categories} cat ON ctx.contextlevel = " . CONTEXT_COURSECAT . " AND cat.id = ctx.instanceid
+              LEFT JOIN {course} c ON ctx.contextlevel = " . CONTEXT_COURSE . " AND c.id = ctx.instanceid
+              LEFT JOIN {course_modules} cm ON ctx.contextlevel = " . CONTEXT_MODULE . " AND cm.id = ctx.instanceid
+              LEFT JOIN {block_instances} bi ON ctx.contextlevel = " . CONTEXT_BLOCK . " AND bi.id = ctx.instanceid
+           $select
+          ORDER BY ctx.contextlevel, bi.defaultregion, COALESCE(cat.sortorder, c.sortorder, cm.section, bi.defaultweight), u.lastname, u.firstname, cm.id
             ", $params);
 }
 
@@ -3996,7 +3949,7 @@ function get_related_contexts_string($context) {
  * Returns capability information (cached)
  *
  * @param string $capabilityname
- * @return object or NULL if capability not found
+ * @return object or null if capability not found
  */
 function get_capability_info($capabilityname) {
     global $ACCESSLIB_PRIVATE, $DB; // one request per page only
@@ -4014,7 +3967,7 @@ function get_capability_info($capabilityname) {
         }
     }
 
-    return isset($ACCESSLIB_PRIVATE->capabilities[$capabilityname]) ? $ACCESSLIB_PRIVATE->capabilities[$capabilityname] : NULL;
+    return isset($ACCESSLIB_PRIVATE->capabilities[$capabilityname]) ? $ACCESSLIB_PRIVATE->capabilities[$capabilityname] : null;
 }
 
 /**
@@ -4212,7 +4165,6 @@ function get_user_roles_in_course($userid, $courseid) {
 /**
  * Checks if a user can assign users to a particular role in this context
  *
- * @global object
  * @param object $context
  * @param int $targetroleid - the id of the role you want to assign users to
  * @return boolean
@@ -4245,7 +4197,7 @@ function user_can_assign($context, $targetroleid) {
  */
 function get_all_roles() {
     global $DB;
-    return $DB->get_records('role', NULL, 'sortorder ASC');
+    return $DB->get_records('role', null, 'sortorder ASC');
 }
 
 /**
@@ -4270,7 +4222,7 @@ function get_archetype_roles($archetype) {
  * @param string $order defaults to 'c.contextlevel DESC, r.sortorder ASC'
  * @return array
  */
-function get_user_roles($context, $userid=0, $checkparentcontexts=true, $order='c.contextlevel DESC, r.sortorder ASC') {
+function get_user_roles($context, $userid = 0, $checkparentcontexts = true, $order = 'c.contextlevel DESC, r.sortorder ASC') {
     global $USER, $DB;
 
     if (empty($userid)) {
@@ -4305,7 +4257,6 @@ function get_user_roles($context, $userid=0, $checkparentcontexts=true, $order='
 /**
  * Creates a record in the role_allow_override table
  *
- * @global object
  * @param int $sroleid source roleid
  * @param int $troleid target roleid
  * @return int id or false
@@ -4322,7 +4273,6 @@ function allow_override($sroleid, $troleid) {
 /**
  * Creates a record in the role_allow_assign table
  *
- * @global object
  * @param int $sroleid source roleid
  * @param int $troleid target roleid
  * @return int id or false
@@ -4339,7 +4289,6 @@ function allow_assign($fromroleid, $targetroleid) {
 /**
  * Creates a record in the role_allow_switch table
  *
- * @global object
  * @param int $sroleid source roleid
  * @param int $troleid target roleid
  * @return int id or false
@@ -4360,7 +4309,7 @@ function allow_switch($fromroleid, $targetroleid) {
  * @param int $rolenamedisplay the type of role name to display. One of the
  *      ROLENAME_X constants. Default ROLENAME_ALIAS.
  * @param bool $withusercounts if true, count the number of users with each role.
- * @param integer|object $user A user id or object. By default (NULL) checks the permissions of the current user.
+ * @param integer|object $user A user id or object. By default (null) checks the permissions of the current user.
  * @return array if $withusercounts is false, then an array $roleid => $rolename.
  *      if $withusercounts is true, returns a list of three arrays,
  *      $rolenames, $rolecounts, and $nameswithcounts.
@@ -4455,8 +4404,6 @@ function get_assignable_roles($context, $rolenamedisplay = ROLENAME_ALIAS, $with
  * This function just process the contents of the role_allow_switch table. You also need to
  * test the moodle/role:switchroles to see if the user is allowed to switch in the first place.
  *
- * @global object
- * @global object
  * @param object $context a context.
  * @return array an array $roleid => $rolename.
  */
@@ -4484,14 +4431,12 @@ function get_switchable_roles($context) {
 
     $query = "
         SELECT r.id, r.name
-        FROM (
-            SELECT DISTINCT rc.roleid
-            FROM {role_capabilities} rc
-            $extrajoins
-            $extrawhere
-        ) idlist
-        JOIN {role} r ON r.id = idlist.roleid
-        ORDER BY r.sortorder";
+          FROM (SELECT DISTINCT rc.roleid
+                  FROM {role_capabilities} rc
+                  $extrajoins
+                  $extrawhere) idlist
+          JOIN {role} r ON r.id = idlist.roleid
+      ORDER BY r.sortorder";
 
     $rolenames = $DB->get_records_sql_menu($query, $params);
     return role_fix_names($rolenames, $context, ROLENAME_ALIAS);
@@ -4500,8 +4445,6 @@ function get_switchable_roles($context) {
 /**
  * Gets a list of roles that this user can override in this context.
  *
- * @global object
- * @global object
  * @param object $context the context.
  * @param int $rolenamedisplay the type of role name to display. One of the
  *      ROLENAME_X constants. Default ROLENAME_ALIAS.
@@ -4611,7 +4554,6 @@ function get_default_enrol_roles($context, $addroleid = null) {
 }
 
 /**
- * @global object
  * @param integer $roleid the id of a role.
  * @return array list of the context levels at which this role may be assigned.
  */
@@ -4622,7 +4564,6 @@ function get_role_contextlevels($roleid) {
 }
 
 /**
- * @global object
  * @param integer $contextlevel a contextlevel.
  * @return array list of role ids that are assignable at this context level.
  */
@@ -4659,7 +4600,6 @@ function get_default_contextlevels($rolearchetype) {
  * Set the context levels at which a particular role can be assigned.
  * Throws exceptions in case of error.
  *
- * @global object
  * @param integer $roleid the id of a role.
  * @param array $contextlevels the context levels at which this role should be assignable,
  *      duplicate levels are removed.
@@ -4668,7 +4608,7 @@ function get_default_contextlevels($rolearchetype) {
 function set_role_contextlevels($roleid, array $contextlevels) {
     global $DB;
     $DB->delete_records('role_context_levels', array('roleid' => $roleid));
-    $rcl = new stdClass;
+    $rcl = new stdClass();
     $rcl->roleid = $roleid;
     $contextlevels = array_unique($contextlevels);
     foreach ($contextlevels as $level) {
@@ -4704,16 +4644,16 @@ function set_role_contextlevels($roleid, array $contextlevels) {
  *               in $groups.
  * @return mixed
  */
-function get_users_by_capability($context, $capability, $fields='', $sort='', $limitfrom='', $limitnum='',
-                                 $groups='', $exceptions='', $doanything_ignored=NULL, $view_ignored=NULL, $useviewallgroups=false) {
+function get_users_by_capability($context, $capability, $fields = '', $sort = '', $limitfrom = '', $limitnum = '',
+                                 $groups = '', $exceptions = '', $doanything_ignored = null, $view_ignored = null, $useviewallgroups = false) {
     global $CFG, $DB;
 
     if (empty($context->id)) {
         throw new coding_exception('Invalid context specified');
     }
 
-    $defaultuserroleid      = isset($CFG->defaultuserroleid) ? $CFG->defaultuserroleid : NULL;
-    $defaultfrontpageroleid = isset($CFG->defaultfrontpageroleid) ? $CFG->defaultfrontpageroleid : NULL;
+    $defaultuserroleid      = isset($CFG->defaultuserroleid) ? $CFG->defaultuserroleid : null;
+    $defaultfrontpageroleid = isset($CFG->defaultfrontpageroleid) ? $CFG->defaultfrontpageroleid : null;
 
     $ctxids = trim($context->path, '/');
     $ctxids = str_replace('/', ',', $ctxids);
@@ -4979,14 +4919,13 @@ function get_users_by_capability($context, $capability, $fields='', $sort='', $l
  * to weed out admin-ish roles. Or fetch a list of roles from
  * variables like $CFG->coursecontact .
  *
- * @global object
  * @param array $users Users array, keyed on userid
  * @param object $context
  * @param array $roles ids of the roles to include, optional
  * @param string $policy defaults to locality, more about
  * @return array sorted copy of the array
  */
-function sort_by_roleassignment_authority($users, $context, $roles=array(), $sortpolicy='locality') {
+function sort_by_roleassignment_authority($users, $context, $roles = array(), $sortpolicy = 'locality') {
     global $DB;
 
     $userswhere = ' ra.userid IN (' . implode(',',array_keys($users)) . ')';
@@ -5039,7 +4978,6 @@ function sort_by_roleassignment_authority($users, $context, $roles=array(), $sor
 /**
  * Gets all the users assigned this role in this context or higher
  *
- * @global object
  * @param int $roleid (can also be an array of ints!)
  * @param stdClass $context
  * @param bool $parent if true, get list of users assigned in higher context too
@@ -5053,9 +4991,9 @@ function sort_by_roleassignment_authority($users, $context, $roles=array(), $sor
  * @param string|array $whereparams defaults to ''
  * @return array
  */
-function get_role_users($roleid, $context, $parent=false, $fields='',
-        $sort='u.lastname, u.firstname', $gethidden_ignored=NULL, $group='',
-        $limitfrom='', $limitnum='', $extrawheretest='', $whereparams=array()) {
+function get_role_users($roleid, $context, $parent = false, $fields = '',
+        $sort = 'u.lastname, u.firstname', $gethidden_ignored = null, $group = '',
+        $limitfrom = '', $limitnum = '', $extrawheretest = '', $whereparams = array()) {
     global $DB;
 
     if (empty($fields)) {
@@ -5115,13 +5053,12 @@ function get_role_users($roleid, $context, $parent=false, $fields='',
 /**
  * Counts all the users assigned this role in this context or higher
  *
- * @global object
  * @param mixed $roleid either int or an array of ints
  * @param object $context
  * @param bool $parent if true, get list of users assigned in higher context too
  * @return int Returns the result count
  */
-function count_role_users($roleid, $context, $parent=false) {
+function count_role_users($roleid, $context, $parent = false) {
     global $DB;
 
     if ($parent) {
@@ -5158,9 +5095,8 @@ function count_role_users($roleid, $context, $parent=false) {
  * This function gets the list of courses that this user has a particular capability in.
  * It is still not very efficient.
  *
- * @global object
  * @param string $capability Capability in question
- * @param int $userid User ID or NULL for current user
+ * @param int $userid User ID or null for current user
  * @param bool $doanything True if 'doanything' is permitted (default)
  * @param string $fieldsexceptid Leave blank if you only need 'id' in the course records;
  *   otherwise use a comma-separated list of the fields you require, not including id
@@ -5168,7 +5104,7 @@ function count_role_users($roleid, $context, $parent=false) {
  *   table with sql modifiers (DESC) if needed
  * @return array Array of courses, may have zero entries. Or false if query failed.
  */
-function get_user_capability_course($capability, $userid=NULL, $doanything=true, $fieldsexceptid='', $orderby='') {
+function get_user_capability_course($capability, $userid = null, $doanything = true, $fieldsexceptid = '', $orderby = '') {
     global $DB;
 
     // Convert fields list and ordering
@@ -5183,7 +5119,7 @@ function get_user_capability_course($capability, $userid=NULL, $doanything=true,
         $fields = explode(',', $orderby);
         $orderby = '';
         foreach($fields as $field) {
-            if($orderby) {
+            if ($orderby) {
                 $orderby .= ',';
             }
             $orderby .= 'c.'.$field;
@@ -5206,7 +5142,7 @@ function get_user_capability_course($capability, $userid=NULL, $doanything=true,
     // Check capability for each course in turn
     $courses = array();
     foreach ($rs as $coursecontext) {
-        if(has_capability($capability, $coursecontext, $userid, $doanything)) {
+        if (has_capability($capability, $coursecontext, $userid, $doanything)) {
             // We've got the capability. Make the record look like a course record
             // and store it
             $coursecontext->id = $coursecontext->courseid;
@@ -5220,10 +5156,10 @@ function get_user_capability_course($capability, $userid=NULL, $doanything=true,
     return $courses;
 }
 
-/** This function finds the roles assigned directly to this context only
+/**
+ * This function finds the roles assigned directly to this context only
  * i.e. no parents role
  *
- * @global object
  * @param object $context
  * @return array
  */
@@ -5250,7 +5186,6 @@ function get_roles_on_exact_context($context) {
  *
  * This function *will* modify $USER->access - beware
  *
- * @global object
  * @param integer $roleid the role to switch to.
  * @param object $context the context in which to perform the switch.
  * @return bool success or failure.
@@ -5339,7 +5274,6 @@ function get_roles_with_override_on_context($context) {
 /**
  * Get all capabilities for this role on this context (overrides)
  *
- * @global object
  * @param object $role
  * @param object $context
  * @return array
@@ -5356,7 +5290,6 @@ function get_capabilities_from_role_on_context($role, $context) {
 /**
  * Find out which roles has assignment on this context
  *
- * @global object
  * @param object $context
  * @return array
  *
@@ -5375,7 +5308,6 @@ function get_roles_with_assignment_on_context($context) {
 /**
  * Find all user assignment of users for this role, on this context
  *
- * @global object
  * @param object $role
  * @param object $context
  * @return array
@@ -5392,13 +5324,12 @@ function get_users_from_role_on_context($role, $context) {
 /**
  * Simple function returning a boolean true if roles exist, otherwise false
  *
- * @global object
  * @param int $userid
  * @param int $roleid
  * @param int $contextid
  * @return bool
  */
-function user_has_role_assignment($userid, $roleid, $contextid=0) {
+function user_has_role_assignment($userid, $roleid, $contextid = 0) {
     global $DB;
 
     if ($contextid) {
@@ -5411,7 +5342,6 @@ function user_has_role_assignment($userid, $roleid, $contextid=0) {
 /**
  * Get role name or alias if exists and format the text.
  *
- * @global object
  * @param object $role role object
  * @param object $coursecontext
  * @return string name of role in course context
@@ -5429,12 +5359,11 @@ function role_get_name($role, $coursecontext) {
 /**
  * Prepare list of roles for display, apply aliases and format text
  *
- * @global object
  * @param array $roleoptions array roleid => rolename or roleid => roleobject
  * @param object $context a context
  * @return array Array of context-specific role names, or role objexts with a ->localname field added.
  */
-function role_fix_names($roleoptions, $context, $rolenamedisplay=ROLENAME_ALIAS) {
+function role_fix_names($roleoptions, $context, $rolenamedisplay = ROLENAME_ALIAS) {
     global $DB;
 
     // Make sure we are working with an array roleid => name. Normally we
@@ -5535,7 +5464,6 @@ function component_level_changed($cap, $comp, $contextlevel) {
 /**
  * Rebuild all related context depth and path caches
  *
- * @global object
  * @param array $fixcontexts array of contexts, strongtyped
  */
 function rebuild_contexts(array $fixcontexts) {
@@ -5556,7 +5484,7 @@ function rebuild_contexts(array $fixcontexts) {
  *
  * @param bool $force force a complete rebuild of the path and depth fields, defaults to false
  */
-function build_context_path($force=false) {
+function build_context_path($force = false) {
     global $CFG, $DB;
 
     // System context
@@ -5822,8 +5750,6 @@ function get_dirty_contexts($time) {
  * Mark a context as dirty (with timestamp)
  * so as to force reloading of the context.
  *
- * @global object
- * @global object
  * @param string $path context path
  */
 function mark_context_dirty($path) {
@@ -5890,7 +5816,6 @@ function fix_role_sortorder($allroles) {
 /**
  * Switch the sort order of two roles (used in admin/roles/manage.php).
  *
- * @global object
  * @param object $first The first role. Actually, only ->sortorder is used.
  * @param object $second The second role. Actually, only ->sortorder is used.
  * @return boolean success or failure
@@ -5907,7 +5832,6 @@ function switch_roles($first, $second) {
 /**
  * duplicates all the base definitions of a role
  *
- * @global object
  * @param object $sourcerole role to copy from
  * @param int $targetrole id of role to copy to
  */