public static function minify($html, $options = array())
{
if (isset($options['cssMinifier'])) {
self::$_cssMinifier = $options['cssMinifier'];
}
if (isset($options['jsMinifier'])) {
self::$_jsMinifier = $options['jsMinifier'];
}
$html = str_replace("\r\n", "\n", trim($html));
self::$_isXhtml = isset($options['xhtml']) ? (bool) $options['xhtml'] : false !== strpos($html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML');
self::$_replacementHash = 'MINIFYHTML' . md5(time());
self::$_placeholders = array();
// replace SCRIPTs (and minify) with placeholders
$html = preg_replace_callback('/\\s*(<script\\b[^>]*?>)([\\s\\S]*?)<\\/script>\\s*/i', array(self::$className, '_removeScriptCB'), $html);
// replace STYLEs (and minify) with placeholders
$html = preg_replace_callback('/\\s*(<style\\b[^>]*?>)([\\s\\S]*?)<\\/style>\\s*/i', array(self::$className, '_removeStyleCB'), $html);
// remove HTML comments (not containing IE conditional comments).
$html = preg_replace_callback('/<!--([\\s\\S]*?)-->/', array(self::$className, '_commentCB'), $html);
// replace PREs with placeholders
$html = preg_replace_callback('/\\s*(<pre\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i', array(self::$className, '_removePreCB'), $html);
// replace TEXTAREAs with placeholders
$html = preg_replace_callback('/\\s*(<textarea\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i', array(self::$className, '_removeTaCB'), $html);
// trim each line.
// @todo take into account attribute values that span multiple lines.
$html = preg_replace('/^\\s+|\\s+$/m', '', $html);
// remove ws around block/undisplayed elements
$html = preg_replace('/\\s+(<\\/?(?:area|base(?:font)?|blockquote|body' . '|caption|center|cite|col(?:group)?|dd|dir|div|dl|dt|fieldset|form' . '|frame(?:set)?|h[1-6]|head|hr|html|legend|li|link|map|menu|meta' . '|ol|opt(?:group|ion)|p|param|t(?:able|body|head|d|h||r|foot|itle)' . '|ul)\\b[^>]*>)/i', '$1', $html);
// remove ws outside of all elements
$html = preg_replace_callback('/>([^<]+)</', array(self::$className, '_outsideTagCB'), $html);
// use newlines before 1st attribute in open tags (to limit line lengths)
$html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "\$1\n\$2", $html);
// fill placeholders
$html = str_replace(array_keys(self::$_placeholders), array_values(self::$_placeholders), $html);
self::$_placeholders = array();
self::$_cssMinifier = self::$_jsMinifier = null;
return $html;
}