QueryPath\DOMQuery::__call PHP Method

    public function __call($name, $arguments)
    {
        if (!ExtensionRegistry::$useRegistry) {
            throw new \QueryPath\Exception("No method named {$name} found (Extensions disabled).");
        }
        // Loading of extensions is deferred until the first time a
        // non-core method is called. This makes constructing faster, but it
        // may make the first invocation of __call() slower (if there are
        // enough extensions.)
        //
        // The main reason for moving this out of the constructor is that most
        // new DOMQuery instances do not use extensions. Charging qp() calls
        // with the additional hit is not a good idea.
        //
        // Also, this will at least limit the number of circular references.
        if (empty($this->ext)) {
            // Load the registry
            $this->ext = ExtensionRegistry::getExtensions($this);
        }
        // Note that an empty ext registry indicates that extensions are disabled.
        if (!empty($this->ext) && ExtensionRegistry::hasMethod($name)) {
            $owner = ExtensionRegistry::getMethodClass($name);
            $method = new \ReflectionMethod($owner, $name);
            return $method->invokeArgs($this->ext[$owner], $arguments);
        }
        throw new \QueryPath\Exception("No method named {$name} found. Possibly missing an extension.");
    }