How can I strip whitespace only elements from an array?

Question

How I can remove all elements of an array that contain just whitespace, not whitespace in an element like \"foobar \" but just empty array elements like <

Answer 1

This code takes advantage of the callback parameter for array_filter. It will loop the array, call trim() on the value, and remove it if the resulting value evaluates to false. (which an empty string will)

$a = array_filter($a, 'trim');