Wordpress HTML-minifying

warwick.php

/**
 * Warwick
 * Very small HTML from WordPress. Place at the end of your theme's functions.php
 * @version 0.8.0
 * @link https://gist.github.com/shinmai/add32c1c61750fb6dd58cbf0525b4a9a
 * @license http://www.wtfpl.net/txt/copying/ WTFPL
 * @author Aapo Saaristo <[email protected]>
 */
class Warwick{protected $html;public function __construct($h){$this->go($h);}public function __toString(){return $this->html;}protected function filter($h){preg_match_all('/<(?<script>script).*?<\/script\s*>|<(?<style>style).*?<\/style\s*>|<!(?<comment>--).*?-->|<(?<tag>[\/\w.:-]*)(?:".*?"|\'.*?\'|[^\'">]+)*>|(?<text>((<[^!\/\w.:-])?[^<]*)+)|/si',$h,$m,PREG_SET_ORDER);$o=false;$r=false;$h='';foreach($m as $t){$ta=(isset($t['tag']))?strtolower($t['tag']):null;$c=$t[0];if(is_null($ta)){$s=!empty($t['script'])||!empty($t['style']);if($c=='<!-- no-minify -->'){$o=!$o;continue;}else if(!$o&&$r!='textarea')$c=preg_replace('/<!--(?!\s*(?:\[if [^\]]+]|<!|>))(?:(?!-->).)*-->/s','',$c);}else if($ta=='pre'||$ta=='textarea')$r=$ta;else if($ta=='/pre'||$ta=='/textarea')$r=false;else if($r||$o)$s=false;else{$s=true;$c=str_replace(' />','/>',preg_replace('/(\s+)(\w++(?<!\baction|\balt|\bcontent|\bsrc)="")/','$1',$c));}if($s)$c=$this->strip($c);$h.=$c;}return $h;}public function go($h){$this->html=$this->filter($h);}protected function strip($s){while(stristr($s=str_replace("\n",'',str_replace("\t",' ',str_replace("\r",'', $s))),'  '))$s=str_replace('  ',' ',$s);return $s;}}function Warwick_finish($h){return new Warwick($h);}function Warwick_start(){ob_start('Warwick_finish');}
//add_action('get_header', 'Warwick_start'); // Uncomment to enable