How to call PHP anonymous function with different order of arguments

Question

I want to call an anonymous function (lambda or closure) which has some arguments, I know the argument names but I don\'t know their order! The call_user_func_array() functi

Answer 1

You have to pass the parameters positionally, names aren't considered at all. You can map the parameters by name to their position using reflection:

$params = array("a" => 1, "b" => 2, "c" => 3);
$ref = new ReflectionFunction($function);

$arguments = array_map(
    function (ReflectionParameter $param) use ($params) {
        if (isset($params[$param->getName()])) {
            return $params[$param->getName()];
        }
        if ($param->isOptional()) {
            return $param->getDefaultValue();
        }
        throw new InvalidArgumentException('Missing parameter ' . $param->getName());
    },
    $ref->getParameters()
);

$ref->invokeArgs($arguments);