Ticket #32238: #32238.1.patch

wp-includes/plugin.php

@@ -105 +105 @@
  */
 function has_filter($tag, $function_to_check = false) {
         // Don't reset the internal array pointer
-        $wp_filter = $GLOBALS['wp_filter'];
+    $wp_filter = $GLOBALS['wp_filter'];
 
-        $has = ! empty( $wp_filter[ $tag ] );
+    if( false === $function_to_check ) {
+        if( empty( $wp_filter[ $tag ] ) ) return false;
 
-        // Make sure at least one priority has a filter callback
-        if ( $has ) {
-                $exists = false;
-                foreach ( $wp_filter[ $tag ] as $callbacks ) {
-                        if ( ! empty( $callbacks ) ) {
-                                $exists = true;
-                                break;
-                        }
-                }
+        // Make sure at least one priority has a filter callback
+        foreach ( $wp_filter[ $tag ] as $priority => $callbacks ) {
+            if ( ! empty ( $callbacks ) ) {
+                /* Bug in case $priority equal zero */
+                return $priority !== 0 ? $priority : true;
+            }
+        }
 
-                if ( ! $exists ) {
-                        $has = false;
-                }
-        }
+        return false;
+    }
 
-        if ( false === $function_to_check || false == $has )
-                return $has;
-
-        if ( !$idx = _wp_filter_build_unique_id($tag, $function_to_check, false) )
-                return false;
+    if ( ! $idx = _wp_filter_build_unique_id( $tag, $function_to_check, false ) )
+        return false;
 
-        foreach ( (array) array_keys($wp_filter[$tag]) as $priority ) {
-                if ( isset($wp_filter[$tag][$priority][$idx]) )
-                        return $priority;
-        }
+    foreach ( (array) array_keys( $wp_filter[$tag]) as $priority ) {
+        if ( isset( $wp_filter[$tag][$priority][$idx] ) )
+            return $priority !== 0 ? $priority : true;
+    }
 
-        return false;
+    return false;
 }
 
 /**