servo-php / fluidxml

                return [];

        }

        protected function insertStringString($parent, $k, $v, $fn)

        {

                // The user has passed an element name and an element value:

                // [ 'element' => 'Element content' ]

                $el = $this->createElement($k, $v);

                $el = $fn($parent, $el);

                return [ $el ];

        }

        protected function insertStringMixed($parent, $k, $v, $fn, &$optionals)

        {

                return [ $el ];

        }

        protected function insertStringMixed($parent, $k, $v, $fn, &$optionals)

        {

                // The user has passed one of these two cases:

                // - [ 'element' => [...] ]

                // - [ 'element' => DOMNode|SimpleXMLElement|FluidXml ]

                $el = $this->createElement($k);

                $el = $fn($parent, $el);

                // The new children elements must be created in the order

                // they are supplied, so 'appendChild' is the perfect operation.

                $this->newContext($el)->appendChild($v, ...$optionals);

                return [ $el ];

        }

        protected function insertIntegerArray($parent, $k, $v, $fn, &$optionals)

        {