Get number of parameters a function requires

Question

This is an extension question of PHP pass in $this to function outside class

And I believe this is what I\'m looking for but it\'s in python not php: Programmaticall

Answer 1

Use Reflection, especially ReflectionFunction in your case.

$fct = new ReflectionFunction('client_func');
echo $fct->getNumberOfRequiredParameters();

As far as I can see you will find getParameters() useful too