diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index 203d161db05..5841958d0c0 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -941,7 +941,6 @@ class auth_plugin_mnet extends auth_plugin_base {
         // run the keepalive client
         $this->keepalive_client();
 
-        // admin/cron.php should have run srand for us
         $random100 = rand(0,100);
         if ($random100 < 10) {     // Approximately 10% of the time.
             // nuke olden sessions
diff --git a/lib/adodb/adodb.inc.php b/lib/adodb/adodb.inc.php
index af89cf5b29c..f7b1404d837 100644
--- a/lib/adodb/adodb.inc.php
+++ b/lib/adodb/adodb.inc.php
@@ -169,11 +169,6 @@
 				die("Illegal path http:// or ftp://");
 		}
 		
-			
-		// Initialize random number generator for randomizing cache flushes
-		// -- note Since PHP 4.2.0, the seed  becomes optional and defaults to a random value if omitted.
-		 srand(((double)microtime())*1000000);
-		
 		/**
 		 * ADODB version as a string.
 		 */
diff --git a/lib/cronlib.php b/lib/cronlib.php
index bc5e29abc56..39321cb8485 100644
--- a/lib/cronlib.php
+++ b/lib/cronlib.php
@@ -67,7 +67,6 @@ function cron_run() {
     // Run cleanup core cron jobs, but not every time since they aren't too important.
     // These don't have a timer to reduce load, so we'll use a random number
     // to randomly choose the percentage of times we should run these jobs.
-    srand ((double) microtime() * 10000000);
     $random100 = rand(0,100);
     if ($random100 < 20) {     // Approximately 20% of the time.
         mtrace("Running clean-up tasks...");
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 03986f6b40f..99735c63d70 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -9540,7 +9540,6 @@ function unformat_float($locale_float, $strict = false) {
  */
 function swapshuffle($array) {
 
-    srand ((double) microtime() * 10000000);
     $last = count($array) - 1;
     for ($i=0;$i<=$last;$i++) {
         $from = rand(0,$last);
@@ -9580,7 +9579,6 @@ function swapshuffle_assoc($array) {
  * @return array
  */
 function draw_rand_array($array, $draws) {
-    srand ((double) microtime() * 10000000);
 
     $return = array();
 
diff --git a/lib/tests/accesslib_test.php b/lib/tests/accesslib_test.php
index 442f9f09abc..4d431a5fcda 100644
--- a/lib/tests/accesslib_test.php
+++ b/lib/tests/accesslib_test.php
@@ -2016,12 +2016,10 @@ class accesslib_testcase extends advanced_testcase {
             $userids = array_slice($userids, 0, 5);
         }
 
-        // Random time!
-        //srand(666);
-        foreach($userids as $userid) { // no guest or deleted
-            // each user gets 0-10 random roles
+        foreach ($userids as $userid) { // No guest or deleted.
+            // Each user gets 0-10 random roles.
             $rcount = rand(0, 10);
-            for($j=0; $j<$rcount; $j++) {
+            for ($j=0; $j<$rcount; $j++) {
                 $roleid = $roles[rand(0, count($roles)-1)];
                 $contextid = $contexts[rand(0, count($contexts)-1)]->id;
                 role_assign($roleid, $userid, $contextid);