MODX Plugin htmlMinify

htmlMinify.pl.php

<?php
$e =& $modx->event;
switch ($e->name) {
    case "OnWebPagePrerender": {

        $output = &$modx->resource->_output;

        $search = array(
            '/\>[^\S ]+/s',     // strip whitespaces after tags, except space
            '/[^\S ]+\</s',     // strip whitespaces before tags, except space
            '/(\s)+/s',         // shorten multiple whitespace sequences
            '/<!--(.|\s)*?-->/' // Remove HTML comments
        );

        $replace = array(
            '>',
            '<',
            '\\1',
            ''
        );

        $output = preg_replace($search, $replace, $output);
        $modx->resource->_output = $output;
        break;
    }
}