diff --git a/admin/delete.php b/admin/delete.php
index a6b75993a52..37d9979a576 100644
--- a/admin/delete.php
+++ b/admin/delete.php
@@ -3,23 +3,23 @@
 // Deletes the moodledata directory, COMPLETELY!!
 // BE VERY CAREFUL USING THIS!
 
-    require_once("../config.php");
+    require_once('../config.php');
 
     require_login();
 
     if (!isadmin()) {
-        error("You must be admin to use this script!");
+        error('You must be admin to use this script!');
     }
 
     $deletedir = $CFG->dataroot;   // The directory to delete!
 
     if (!$sure) {
-        notice_yesno ("Are you completely sure you want to delete everything inside the directory $deletedir ?", "delete.php?sure=yes", "index.php");
+        notice_yesno ('Are you completely sure you want to delete everything inside the directory '. $deletedir .' ?', 'delete.php?sure=yes', 'index.php');
         exit;
     }
 
     if (!$reallysure) {
-        notice_yesno ("Are you REALLY REALLY completely sure you want to delete everything inside the directory $deletedir (this includes all user images, and any other course files that have been created) ?", "delete.php?sure=yes&reallysure=yes", "index.php");
+        notice_yesno ('Are you REALLY REALLY completely sure you want to delete everything inside the directory '. $deletedir .' (this includes all user images, and any other course files that have been created) ?', 'delete.php?sure=yes&reallysure=yes', 'index.php');
         exit;
     }
 
@@ -27,7 +27,7 @@
 
     delete_subdirectories($deletedir);
 
-    echo "<h1 align="center">Done!</h1>";
+    echo '<h1 align="center">Done!</h1>';
     print_continue($CFG->wwwroot);
     exit;
 
@@ -37,22 +37,22 @@ function delete_subdirectories($rootdir) {
     $dir = opendir($rootdir);
 
     while ($file = readdir($dir)) {
-        if ($file != "." and $file != "..") {
-            $fullfile = "$rootdir/$file";
-            if (filetype($fullfile) == "dir") {
+        if ($file != '.' and $file != '..') {
+            $fullfile = $rootdir .'/'. $file;
+            if (filetype($fullfile) == 'dir') {
                 delete_subdirectories($fullfile);
-                echo "Deleting $fullfile ... ";
+                echo 'Deleting '. $fullfile .' ... ';
                 if (rmdir($fullfile)) {
-                    echo "Done.<br />";
+                    echo 'Done.<br />';
                 } else {
-                    echo "FAILED.<br />";
+                    echo 'FAILED.<br />';
                 }
             } else {
-                echo "Deleting $fullfile ... ";
-                if (unlink("$fullfile")) {
-                    echo "Done.<br />";
+                echo 'Deleting '. $fullfile .' ... ';
+                if (unlink($fullfile)) {
+                    echo 'Done.<br />';
                 } else {
-                    echo "FAILED.<br />";
+                    echo 'FAILED.<br />';
                 }
             }
         }
@@ -60,4 +60,4 @@ function delete_subdirectories($rootdir) {
     closedir($dir);
 }
   
-?>
+?>
\ No newline at end of file
diff --git a/error/index.php b/error/index.php
index 6906642fd2c..542883c2aa5 100644
--- a/error/index.php
+++ b/error/index.php
@@ -1,23 +1,23 @@
 <?PHP // $Id$
 
-    require("../config.php");
+    require('../config.php');
 
     if (isset($text)) {    // form submitted
         if (!$admin = get_admin() ) {
-            error("Could not find the admin user to mail to!");
+            error('Could not find the admin user to mail to!');
         }
 
-        email_to_user($admin, $USER, "Error: $referer -> $requested", "$text");
+        email_to_user($admin, $USER, 'Error: '. $referer .' -> '. $requested, $text);
 
-        redirect("$CFG->wwwroot/course/", "Message sent, thanks", 3);
+        redirect($CFG->wwwroot .'/course/', 'Message sent, thanks', 3);
         die;
     }
 
     $site = get_site();
     
-    print_header("$site->fullname:Error", "$site->fullname: Error 404", "", "form.text");
+    print_header($site->fullname .':Error', $site->fullname .': Error 404', '', 'form.text');
 
-    print_simple_box("An unusual error occurred (tried to reach a page that doesn't exist).<p align="center">$REDIRECT_URL", "center", "", "$THEME->cellheading");
+    print_simple_box('An unusual error occurred (tried to reach a page that doesn\'t exist).<p align="center">'. $REDIRECT_URL, 'center', '', $THEME->cellheading);
   
 ?>
   
@@ -34,4 +34,4 @@
 
   print_footer();
 
-?>
+?>
\ No newline at end of file