How to trim each line in a heredoc (long string) in PHP

Question

I\'m looking to create a PHP function that can trim each line in a long string.

For example,

Answer 1

function trimHereDoc($txt)
{
    return preg_replace('/^\s+|\s+$/m', '', $txt);
}

^\s+ matches whitespace at the start of a line and \s+$ matches whitespace at the end of a line. The m flag says to do multi-line replacement so ^ and $ will match on any line of a multi-line string.