+ foreach ($hook_array[$event] as $index => $hook) {
+
+ $object = null;
+ $method = null;
+ $func = null;
+ $data = null;
+ $have_data = false;
+ $closure = false;
+ $badhookmsg = false;
+
+ /* $hook can be: a function, an object, an array of $function and $data,
+ * an array of just a function, an array of object and method, or an
+ * array of object, method, and data.
+ */
+
+ if ( is_array( $hook ) ) {
+ if ( count( $hook ) < 1 ) {
+ throw new MWException("Empty array in hooks for " . $event . "\n");
+ } else if ( is_object( $hook[0] ) ) {
+ $object = $hook_array[$event][$index][0];
+ if ( $object instanceof Closure ) {
+ $closure = true;
+ if ( count( $hook ) > 1 ) {
+ $data = $hook[1];
+ $have_data = true;
+ }
+ } else {
+ if ( count( $hook ) < 2 ) {
+ $method = "on" . $event;
+ } else {
+ $method = $hook[1];
+ if ( count( $hook ) > 2 ) {
+ $data = $hook[2];
+ $have_data = true;
+ }
+ }
+ }
+ } else if ( is_string( $hook[0] ) ) {
+ $func = $hook[0];
+ if ( count( $hook ) > 1) {
+ $data = $hook[1];
+ $have_data = true;
+ }
+ } else {
+ throw new MWException( "Unknown datatype in hooks for " . $event . "\n" );
+ }
+ } else if ( is_string( $hook ) ) { # functions look like strings, too
+ $func = $hook;
+ } else if ( is_object( $hook ) ) {
+ $object = $hook_array[$event][$index];
+ if ( $object instanceof Closure ) {
+ $closure = true;
+ } else {
+ $method = "on" . $event;
+ }
+ } else {
+ throw new MWException( "Unknown datatype in hooks for " . $event . "\n" );
+ }
+
+ /* We put the first data element on, if needed. */
+
+ if ( $have_data ) {
+ $hook_args = array_merge(array($data), $args);
+ } else {
+ $hook_args = $args;
+ }
+
+ if ( $closure ) {
+ $callback = $object;
+ $func = "hook-$event-closure";
+ } elseif ( isset( $object ) ) {
+ $func = get_class( $object ) . '::' . $method;
+ $callback = array( $object, $method );
+ } elseif ( false !== ( $pos = strpos( $func, '::' ) ) ) {
+ $callback = array( substr( $func, 0, $pos ), substr( $func, $pos + 2 ) );
+ } else {
+ $callback = $func;
+ }
+
+ // Run autoloader (workaround for call_user_func_array bug)
+ is_callable( $callback );
+
+ /* Call the hook. The documentation of call_user_func_array clearly
+ * states that FALSE is returned on failure. However this is not
+ * case always. In some version of PHP if the function signature
+ * does not match the call signature, PHP will issue an warning:
+ * Param y in x expected to be a reference, value given.
+ *
+ * In that case the call will also return null. The following code
+ * catches that warning and provides better error message. The
+ * function documentation also says that:
+ * In other words, it does not depend on the function signature
+ * whether the parameter is passed by a value or by a reference.
+ * There is also PHP bug http://bugs.php.net/bug.php?id=47554 which
+ * is unsurprisingly marked as bogus. In short handling of failures
+ * with call_user_func_array is a failure, the documentation for that
+ * function is wrong and misleading and PHP developers don't see any
+ * problem here.
+ */
+ $retval = null;
+ set_error_handler( array( 'Hooks', 'hookErrorHandler' ) );
+ wfProfileIn( $func );
+ try {
+ $retval = call_user_func_array( $callback, $hook_args );
+ } catch ( MWHookException $e ) {
+ $badhookmsg = $e->getMessage();
+ }
+ wfProfileOut( $func );
+ restore_error_handler();
+
+ /* String return is an error; false return means stop processing. */
+ if ( is_string( $retval ) ) {
+ global $wgOut;
+ $wgOut->showFatalError( $retval );
+ return false;
+ } elseif( $retval === null ) {
+ if ( $closure ) {
+ $prettyFunc = "$event closure";
+ } elseif( is_array( $callback ) ) {
+ if( is_object( $callback[0] ) ) {
+ $prettyClass = get_class( $callback[0] );
+ } else {
+ $prettyClass = strval( $callback[0] );
+ }
+ $prettyFunc = $prettyClass . '::' . strval( $callback[1] );
+ } else {
+ $prettyFunc = strval( $callback );
+ }
+ if ( $badhookmsg ) {
+ throw new MWException( "Detected bug in an extension! " .
+ "Hook $prettyFunc has invalid call signature; " . $badhookmsg );
+ } else {
+ throw new MWException( "Detected bug in an extension! " .
+ "Hook $prettyFunc failed to return a value; " .
+ "should return true to continue hook processing or false to abort." );
+ }
+ } else if ( !$retval ) {
+ return false;
+ }