how to dynamically check number of arguments of a function in php

Question

how can I check at runtime home many parameters a method or a function have in PHP.

example

class foo {
   function bar ( arg1, arg2 ){
    .....
   }
}

I will need to know if there is a way to run something like

get_func_arg_number ( "foo", "bar" )

and the result to be

2

Answer 1

You need to use reflection to do that.

$method = new ReflectionMethod('foo', 'bar');
$num = $method->getNumberOfParameters();