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class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
public $name = 'YouTube';
public function preFilter($html, $config, $context) {
$pre_regex = '#<object[^>]+>.+?'.
$pre_replace = '<span class="youtube-embed">\1</span>';
return preg_replace($pre_regex, $pre_replace, $html);
public function postFilter($html, $config, $context) {
$post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\-_=]+)</span>#';
return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
protected function armorUrl($url) {
return str_replace('--', '-&#45;', $url);
protected function postFilterCallback($matches) {
$url = $this->armorUrl($matches[1]);
return '<object width="425" height="350" type="application/x-shockwave-flash" '.
'<param name="movie" value="'.$url.'"></param>'.
'<!--[if IE]>'.
'<embed src="'.$url.'"'.
'wmode="transparent" width="425" height="350" />'.
// vim: et sw=4 sts=4