2 replies to this topic

[Fighter]

I was attempting to build an anonymous function with function_create() but it was restrictive, I had read up about lambda functions and came up with the following but to no avail:

$factorial = function($n) {

    if($n <= 0) return 1;

    return $factorial($n - 1) * $n;

};

I believe you would call that a lambda function with enclosure. How would I do this?

[Alexander]

Hi,

You will need to pass a reference of the lambda function you will be creating,

<?php
$factorial = function($n) use (&$factorial) {
    if($n <= 0) 
        return 1;
    return $factorial($n - 1) * $n;
};

print $factorial(5);

this "use" in PHP 5.3 will reference in parent scope and is considered late binding.

You can find a reference to its uses in PHP manual: PHP: rfc:closures [PHP Wiki]

Hope this helps!

[Fighter]

This is exactly what I wanted, thank you so much for the example Null. I quite like this language