Ticket #40731: 40731.patch

src/wp-includes/template.php

@@ -627 +627 @@
  * @return string The template filename if one is located.
  */
 function locate_template($template_names, $load = false, $require_once = true ) {
+        static $template_cache = array();
+        
         $located = '';
         foreach ( (array) $template_names as $template_name ) {
                 if ( !$template_name )
                         continue;
+                if ( isset( $template_cache[$template_name] ) && $template_cache[$template_name] === '' ) {
+                        continue;
+                }
+                if ( isset( $template_cache[$template_name] ) ) {
+                        $located = $template_cache[$template_name];
+                        break;
+                }
                 if ( file_exists(STYLESHEETPATH . '/' . $template_name)) {
-                        $located = STYLESHEETPATH . '/' . $template_name;
+                        $located = $template_cache[$template_name] = STYLESHEETPATH . '/' . $template_name;
                         break;
                 } elseif ( file_exists(TEMPLATEPATH . '/' . $template_name) ) {
-                        $located = TEMPLATEPATH . '/' . $template_name;
+                        $located = $template_cache[$template_name] = TEMPLATEPATH . '/' . $template_name;
                         break;
                 } elseif ( file_exists( ABSPATH . WPINC . '/theme-compat/' . $template_name ) ) {
-                        $located = ABSPATH . WPINC . '/theme-compat/' . $template_name;
+                        $located = $template_cache[$template_name] = ABSPATH . WPINC . '/theme-compat/' . $template_name;
                         break;
                 }
+                $template_cache[$template_name] = '';
         }
 
         if ( $load && '' != $located )