/*过滤除img外html标签*/
    function cleanhtml($str,$tags='<img><a>'){//过滤时默认保留html中的<a><img>标签
        $search = array(
            '@<script[^>]*?>.*?</script>@si',  // Strip out javascript
            /*                      '@<[\/\!]*?[^<>]*?>@si',            // Strip out HTML tags*/
            '@<style[^>]*?>.*?</style>@siU',    // Strip style tags properly
            '@<![\s\S]*?--[ \t\n\r]*>@'         // Strip multi-line comments including CDATA
        );
        $str = preg_replace($search, '', $str);
        $str = strip_tags($str,$tags);
        return $str;
}