public function content($name = null)
    {
        if ($name && isset(self::$_content_for[$name]))
            return self::$_content_for[$name];
    }
public function content($name = null)
    {
        if ($name && isset(self::$_content_for[$name]))
            return self::$_content_for[$name];
    }
public function content ( $ name = null ) { if ( $ name && isset ( self :: $ _content_for [ $ name ] ) ) return self :: $ _content_for [ $ name ] ; }
Yield seems to be a reserved keyword in PHP 5.5.
Forced to change the name of the yield method to "content".
Yield seems to be a reserved keyword in PHP 5 . 5 . Forced to change the name of the yield method to content .