php防注入和XSS攻擊通用過濾

public function SafeFilter($arr){
    $ra=Array('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/','/script/','/javascript/','/vbscript/','/expression/','/applet/','/meta/','/xml/','/blink/','/link/','/style/','/embed/','/object/','/frame/','/layer/','/title/','/bgsound/','/base/','/onload/','/onunload/','/onchange/','/onsubmit/','/onreset/','/onselect/','/onblur/','/onfocus/','/onabort/','/onkeydown/','/onkeypress/','/onkeyup/','/onclick/','/ondblclick/','/onmousedown/','/onmousemove/','/onmouseout/','/onmouseover/','/onmouseup/','/onunload/');
    if (is_array($arr)){
        foreach ($arr as $key => $value){
            if (!is_array($value)){
                //不對magic_quotes_gpc轉義過的字符使用addslashes(),避免雙重轉義。
                if (!get_magic_quotes_gpc()){
                    $value = addslashes($value);  //給單引號（'）、雙引號（"）、反斜線（\）與 NUL（NULL 字符）加上反斜線轉義
                }
                $value = preg_replace($ra,'',$value); //刪除非打印字符，粗暴式過濾xss可疑字符串

                $arr[$key] = htmlentities(strip_tags($value)); //去除 HTML 和 PHP 標記並轉換為 HTML 實體
            }else{
                SafeFilter($arr[$key]);
            }
        }
    }
}