Ticket #16378: 16378.compat.diff

wp-includes/compat.php

@@ -168 +168 @@
         }
         return $parts;
 }
+
+/**
+ * PHP 4 compat version of array_intersect_key() which was introduced
+ * in PHP 5.0.2. This version requires at least PHP 4.0.0.
+ *
+ * @since WordPress 3.1
+ */
+if ( !function_exists( 'array_intersect_key' ) ) {
+        function array_intersect_key() {
+                $args        = func_get_args();
+                $array_count = count( $args );
+
+                if ( $array_count < 2 ) {
+                        user_error( 'Wrong parameter count for array_intersect_key()', E_USER_WARNING );
+                        return;
+                }
+
+                // Check arrays
+                for ( $i = $array_count; $i--; ) {
+                        if ( !is_array( $args[$i] ) ) {
+                                user_error( 'array_intersect_key() Argument #' . ( $i + 1 ) . ' is not an array', E_USER_WARNING );
+                                return;
+                        }
+                }
+
+                // Intersect keys
+                $arg_keys    = array_map( 'array_keys', $args );
+                $result_keys = call_user_func_array( 'array_intersect', $arg_keys );
+
+                // Build return array
+                $result = array( );
+                foreach ( $result_keys as $key )
+                        $result[$key] = $args[0][$key];
+
+                return $result;
+        }
+
+}