php xss 函数

function xss($string) {
    if (is_array($string)||is_object($string)||is_resource($string)) {
        return '';
    }else {
        $string = preg_replace('/[x00-x08x0Bx0Cx0E-x1Fx7F]+/S', '', $string);
    
        $parm1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
    
        $parm2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
    
        $parm = array_merge($parm1, $parm2); 
    
        for ($i = 0; $i < sizeof($parm); $i++) { 
            $pattern = '/';
            //var_dump($parm[$i]); 
            for ($j = 0; $j < strlen($parm[$i]); $j++) { 
                if ($j > 0) { 
                    $pattern .= '('; 
                    $pattern .= '(&#[x|X]0([9][a][b]);?)?'; 
                    $pattern .= '|(&#0([9][10][13]);?)?'; 
                    $pattern .= ')?'; 
                }
                $pattern .= $parm[$i][$j];
                var_dump($pattern); 
            }
            $pattern .= '/i';
            //var_dump($pattern);
            $string = preg_replace($pattern, '', $string); 
        }
        return $string;
    }       
}