Ticket #33982: 33982-jsonserialize.diff

src/wp-includes/functions.php

@@ -2685 +2685 @@
                 $args = array( $data );
         }
 
+        // Prepare the data for JSON serialization.
+        $data = _wp_json_prepare_data( $data );
+
         $json = @call_user_func_array( 'json_encode', $args );
 
         // If json_encode() was successful, no need to do more sanity checking.
@@ -2799 +2802 @@
 }
 
 /**
+ * Prepares response data to be serialized to JSON.
+ *
+ * This supports the JsonSerializable interface for PHP 5.2-5.3 as well.
+ *
+ * @ignore
+ * @since 4.4.0
+ * @access private
+ *
+ * @param mixed $data Native representation.
+ * @return array|string Data ready for `json_encode()`.
+ */
+function _wp_json_prepare_data( $data ) {
+        if ( ! defined( 'WP_JSON_SERIALIZE_COMPATIBLE' ) || WP_JSON_SERIALIZE_COMPATIBLE === false ) {
+                return $data;
+        }
+
+        switch ( gettype( $data ) ) {
+                case 'boolean':
+                case 'integer':
+                case 'double':
+                case 'string':
+                case 'NULL':
+                        // These values can be passed through.
+                        return $data;
+
+                case 'array':
+                        // Arrays must be mapped in case they also return objects.
+                        return array_map( '_wp_json_prepare_data', $data );
+
+                case 'object':
+                        if ( $data instanceof JsonSerializable ) {
+                                $data = $data->jsonSerialize();
+                        } else {
+                                $data = get_object_vars( $data );
+                        }
+
+                        // Now, pass the array (or whatever was returned from jsonSerialize through).
+                        return _wp_json_prepare_data( $data );
+
+                default:
+                        return null;
+        }
+}
+
+/**
  * Send a JSON response back to an Ajax request.
  *
  * @since 3.5.0