php通用防注入和XSS攻击全局过滤代码

<?php
//php防注入和XSS攻击通用过滤.  
//by qq:831937
$_GET         && SafeFilter($_GET);
$_POST        && SafeFilter($_POST);
$_COOKIE    && SafeFilter($_COOKIE);

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))
               {
                    if (!get_magic_quotes_gpc())                         //不对magic_quotes_gpc转义过的字符使用addslashes(),避免双重转义。
                    {
                         $value    = addslashes($value);                     //给单引号（'）、双引号（"）、反斜线（\）与 NUL（NULL 字符）加上反斜线转义
                    }
                    $value             = preg_replace($ra,'',$value);         //删除非打印字符，粗暴式过滤xss可疑字符串
                    $arr[$key]         = htmlentities(strip_tags($value)); //去除 HTML 和 PHP 标记并转换为 HTML 实体
               }
               else
               {
                    SafeFilter($arr[$key]);
               }
          }
     }
}
?>