diff --git a/backup/lib.php b/backup/lib.php
index 393ace0d465..c1013e43b7d 100644
--- a/backup/lib.php
+++ b/backup/lib.php
@@ -129,7 +129,7 @@
         }
 
         // Delete all files in the curent directory return false and halt if a file cannot be removed
-	$countdirfiles = count($dir_files);
+        $countdirfiles = count($dir_files);
         for($i=0; $i<$countdirfiles; $i++) {
             chmod($dir_files[$i], $CFG->directorypermissions);
             if (((unlink($dir_files[$i]))) == FALSE) {
@@ -138,7 +138,7 @@
         }
 
         // Empty sub directories and then remove the directory
-	$countdirsubdirs = count($dir_subdirs);
+        $countdirsubdirs = count($dir_subdirs);
         for($i=0; $i<$countdirsubdirs; $i++) {
             chmod($dir_subdirs[$i], $CFG->directorypermissions);
             if (delete_dir_contents($dir_subdirs[$i]) == FALSE) {
diff --git a/backup/restorelib.php b/backup/restorelib.php
index 917fbb53c9f..d4191617951 100644
--- a/backup/restorelib.php
+++ b/backup/restorelib.php
@@ -377,7 +377,7 @@
                                                 $tagsarr = $info['BLOG']['#']['BLOG_TAGS']['0']['#']['BLOG_TAG'];
                                                 //Iterate over tags
                                                 $tags = array();
-						$sizetagsarr = sizeof($tagsarr);
+                                                $sizetagsarr = sizeof($tagsarr);
                                                 for($i = 0; $i < $sizetagsarr; $i++) {
                                                     $tag_info = $tagsarr[$i];
                                                     ///traverse_xmlize($tag_info);                        //Debug
diff --git a/mod/feedback/item/multichoice/lib.php b/mod/feedback/item/multichoice/lib.php
index 757ba92e502..729c72d6c02 100644
--- a/mod/feedback/item/multichoice/lib.php
+++ b/mod/feedback/item/multichoice/lib.php
@@ -119,7 +119,7 @@ class feedback_item_multichoice extends feedback_item_base {
 
         $analysedAnswer = array();
         if($info->subtype == 'c') {
-	    $sizeofanswers = sizeof($answers);
+            $sizeofanswers = sizeof($answers);
             for($i = 1; $i <= $sizeofanswers; $i++) {
                 $ans = null;
                 $ans->answertext = $answers[$i-1];
@@ -137,7 +137,7 @@ class feedback_item_multichoice extends feedback_item_base {
                 $analysedAnswer[] = $ans;
             }
         }else {
-	    $sizeofanswers = sizeof($answers);
+            $sizeofanswers = sizeof($answers);
             for($i = 1; $i <= $sizeofanswers; $i++) {
                 $ans = null;
                 $ans->answertext = $answers[$i-1];
@@ -169,7 +169,7 @@ class feedback_item_multichoice extends feedback_item_base {
 
         if($info->subtype == 'c') {
             $vallist = array_values(explode (FEEDBACK_MULTICHOICE_LINE_SEP, $value->value));
-	    $sizeofvallist = sizeof($vallist);
+            $sizeofvallist = sizeof($vallist);
             for($i = 0; $i < $sizeofvallist; $i++) {
                 $sizeofpresentation = sizeof($presentation);
                 for($k = 0; $k < $sizeofpresentation; $k++) {
diff --git a/mod/glossary/import.php b/mod/glossary/import.php
index 8d49e9f8748..9a20c887070 100644
--- a/mod/glossary/import.php
+++ b/mod/glossary/import.php
@@ -248,7 +248,7 @@ if ($xml = glossary_read_imported_file($result)) {
             $importedentries++;
 
             $xmlaliases = @$xmlentry['#']['ALIASES'][0]['#']['ALIAS']; // ignore missing ALIASES
-	    $sizeofxmlaliases = sizeof($xmlaliases);
+            $sizeofxmlaliases = sizeof($xmlaliases);
             for($k = 0; $k < $sizeofxmlaliases; $k++) {
             /// Importing aliases
                 $xmlalias = $xmlaliases[$k];
@@ -265,7 +265,7 @@ if ($xml = glossary_read_imported_file($result)) {
             if (!empty($data->catsincl)) {
                 // If the categories must be imported...
                 $xmlcats = @$xmlentry['#']['CATEGORIES'][0]['#']['CATEGORY']; // ignore missing CATEGORIES
-		$sizeofxmlcats = sizeof($xmlcats);
+                $sizeofxmlcats = sizeof($xmlcats);
                 for($k = 0; $k < $sizeofxmlcats; $k++) {
                     $xmlcat = $xmlcats[$k];
 
diff --git a/mod/lesson/importppt.php b/mod/lesson/importppt.php
index 16877278191..243ff3de324 100644
--- a/mod/lesson/importppt.php
+++ b/mod/lesson/importppt.php
@@ -110,7 +110,7 @@ if ($data = $mform->get_data()) {
             // want to allow <b><i>(maybe more) tags but when we do that
             // the preg_match messes up.
             preg_match_all("/(<([\w]+)[^>]*>)([^<\\2>]*)(<\/\\2>)/", $string, $matches);
-	    $countmatches = count($matches[1]);
+            $countmatches = count($matches[1]);
             for($i = 0; $i < $countmatches; $i++) { // go through all of our div matches
 
                 $class = lesson_importppt_isolate_class($matches[1][$i]); // first step in isolating the class
diff --git a/mod/wiki/diff/difflib.php b/mod/wiki/diff/difflib.php
index 1078708879e..61315e66b8c 100644
--- a/mod/wiki/diff/difflib.php
+++ b/mod/wiki/diff/difflib.php
@@ -300,7 +300,7 @@ class ouwiki_line {
         $pos=0;
         while(true) {
             // Find a non-space
-	    $strlendata = strlen($data);
+            $strlendata = strlen($data);
             for(;$pos < $strlendata && substr($data,$pos,1)===' ';$pos++) ;
             if($pos==$strlendata) {
                 // No more content
@@ -528,7 +528,7 @@ class ouwiki_changes {
         //    resulting array will be -,-,3,3,3,-,0
         $squidges=array();
         $lowest=0;
-	$countdiff = count($diff);
+        $countdiff = count($diff);
         for($index1=$countdiff;$index1>=1;$index1--) {
             $index2=$diff[$index1];
             if($index2===0) {
diff --git a/mod/wiki/parser/markups/nwiki.php b/mod/wiki/parser/markups/nwiki.php
index 8041bd7693c..fd1324ea8c7 100644
--- a/mod/wiki/parser/markups/nwiki.php
+++ b/mod/wiki/parser/markups/nwiki.php
@@ -142,7 +142,7 @@ class nwiki_parser extends wiki_markup_parser {
         $cells = array();
         foreach($normalcells as $nc) {
             $headercells = explode("!!", $nc);
-	    $countheadercells = count($headercells);
+            $countheadercells = count($headercells);
             for($i = 0; $i < $countheadercells; $i++) {
                 $cells[] = array($type, $headercells[$i]);
                 $type = 'header';