Add \Countable support to \Closure

Hi Internals, I would like to suggest you a new feature (for PHP5.4 or maybe next). The idea is to implement the \Countable interface into closures to easily count the arguments number. I know that it is already possible with reflection [1] but it could be a comfortable trick I think. Subsidiary questions: do we include optional arguments in our calculation? Here is a trivial example: class Closure implements \Countable { … } $f = function ( $x, $y, $z ) { … }; var_dump(count($f)); // int(3) Javascript already implements this [2]: var f = function ( x, y, z ) { … }; console.log(f.length); Thoughts? Best regards. [1] <http://php.net/reflectionfunctionabstract.getnumberofparameters> [2] <https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/length> -- Ivan Enderlin Developer of Hoa http://hoa.42/ or http://hoa-project.net/ Member of HTML and WebApps Working Group of W3C http://w3.org/