Wrapper function hack for call_user_func_array which enables you to use keyword arguments on PHP functions and methods. It aims to be as close as possible to the behavior of call_user_func_array.

call_user_func_struct.php

<?php

/**
 * @link http://l-x.github.io/blog/2014/09/29/call-user-func-struct/
 * 
 * @param callback $function
 * @param array    $param_struct
 *
 * @return mixed
 */
function call_user_func_struct($function, array $param_struct) {

	/**
	 * @param callback $function
	 *
	 * @return ReflectionFunction|ReflectionMethod
	 */
	$getReflection = function ($function) {
		switch(true) {
			case ($function instanceof \Closure):
			case (is_string($function) && function_exists($function));
				return new \ReflectionFunction($function);
				break;
			case (is_string($function) && strpos($function, '::') !== false):
				$function = explode('::', $function, 2);
			case (is_array($function) && count($function) == 2 && (is_object($function[0]) || is_string($function[0])) && is_string($function[1])):
				return new \ReflectionMethod($function[0], $function[1]);
				break;
			default:
				trigger_error(sprintf("call_user_func_array() expects parameter 1 to be a valid callback, function '%s' not found or invalid function name", print_r($function, true)), E_USER_WARNING);
				exit;
				break;
		}
	};

	/**
	 * @param array                  $params
	 * @param \ReflectionParameter[] $reflection
	 *
	 * @return array
	 */
	$prepareArguments = function (array $params, array $reflection) {
		$prepared_arguments = array();

		foreach($reflection as $parameter) {
			if(isset($params[$parameter->getName()])) {
				$prepared_arguments[] = $params[$parameter->getName()];
			} else if($parameter->isDefaultValueAvailable()) {
				$prepared_arguments[] = $parameter->getDefaultValue();
			} else {
				trigger_error(sprintf("Missing argument %s ($%s) ", count($prepared_arguments) + 1, $parameter->getName()), E_USER_WARNING);
				exit;
			}
		}

		return $prepared_arguments;
	};

	return call_user_func_array($function, $prepareArguments($param_struct, $getReflection($function)->getParameters()));
}