How to check if a method exists and has arguments in PHP

Question

I want to check if a method exists and has arguments. Here is some snippet.

// this only checks if the function exist or not
if(method_exists($controller, 'function_name')) 
{
  //do some stuff
}

But what i want to do is

if(method_exists($controller, 'function_name(with_args)'))
{

}

Answer 1

You can use ReflectionMethod's getParameters to get a list of parameters for a method. You could then check the length of that list or do any other operations you need on the parameters.

<?php
    class Foo {
        function bar($a, $b, $c) {
            return $a + $b + $c;
        }
    }

    $method = new ReflectionMethod('Foo', 'bar');
    var_dump($method->getParameters());
?>

I don't know what you would be using this for but I would advise against using reflection casually. You could probably rethink your way of doing things.