added reduce path function

feulf · feulf · commit b5dd6c0d2d71 · 2012-10-14T13:24:52.000-04:00
diff --git a/system/library/functions.php b/system/library/functions.php
@@ -517,6 +517,18 @@ function upload_image( $file, $thumb_prefix = null, $max_width = 128, $max_heigh
 
 
 
+        function reduce_path( $path ){
+                $path = str_replace( "://", "@not_replace@", $path );
+                $path = preg_replace( "#(/+)#", "/", $path );
+                $path = preg_replace( "#(/\./+)#", "/", $path );
+                $path = str_replace( "@not_replace@", "://", $path );
+
+                while( preg_match( '#\.\./#', $path ) ){
+                    $path = preg_replace('#\w+/\.\./#', '', $path );
+                }
+                return $path;
+        }
+
 
 //-------------------------------------------------------------
 //
