PHP – Removing alpha characters from an entire array using closure

Here’s a quick way to remove all alpha characters from an array using PHP closures (PHP 5.3+)

array_walk($myarray, function(&$element){ $element = trim($element,"ABCDEFGHIJKLMNOPQRSTUVWXYZ"); });

You can also remove all numbers from an array similarly

array_walk($myarray, function(&$element){ $element = trim($element,"0123456789"); });

The variable must be passed by reference in order to change the values of the original array. I really like the addition of closures, which reduces the need to create a new method for simple operations.