转义 javascript 代码标记 函数

来自PHPCMS

/**
 * 转义 javascript 代码标记
 *
 * @param $str
 * @return mixed
 */
 function trim_script($str) {
 if(is_array($str)){
 foreach ($str as $key => $val){
 $str[$key] = trim_script($val);
 }
    }else{
    $str = preg_replace ( '/\]*?)\>/si', '<\\1script\\2>', $str );
 $str = preg_replace ( '/\]*?)\>/si', '<\\1iframe\\2>', $str );
 $str = preg_replace ( '/\]*?)\>/si', '<\\1frame\\2>', $str );
 $str = preg_replace ( '/]]\>/si', ']] >', $str );
    }
 return $str;
}