这篇文章主要介绍了关于web安全防sql注入就是多过滤附PHP过滤函数 ，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

SQL注入与跨站攻击过滤函数，支持SQL注入，跨站脚本攻击和跨站POST提交等常见安全过滤。

 $v)    
     {    
     if(!preg_match("/^[a-zA-Z0-9_-]+$/", $v))    
     {    
                 header_status_404();    
     }    
     }    
     
     $arrStr = array('%0d%0a', "'", '<', '>', '$', 'script', 'document', 'eval','atestu','select','insert?into','delete?from');    
     global_inject_input($_SERVER['HTTP_REFERER'], $arrStr, true);    
     global_inject_input($_SERVER['HTTP_USER_AGENT'], $arrStr, true);    
     global_inject_input($_SERVER['HTTP_ACCEPT_LANGUAGE'], $arrStr, true);    
     global_inject_input($_GET, array_merge($arrStr, array('"')), true);    
     //global_inject_input($_COOKIE, array_merge($arrStr, array('"', '&')), true);    
         //cookie会有对url的记录(pGClX_last_url)。去掉对&的判断    
         global_inject_input($_COOKIE, array_merge($arrStr, array('"')), true);    
     global_inject_input($_SERVER, array('%0d%0a'), true);    
     
     //处理跨域POST提交问题    
     if($_SERVER['REQUEST_METHOD'] == 'POST')    
     {    
     //处理客户端POST请求处理没有HTTP_REFERER参数问题    
     if(isset($_SERVER['HTTP_REFERER']))    
     {    
     $url = parse_url($_SERVER['HTTP_REFERER']);    
     $referer_host = !empty($url['port']) && $url['port'] != '80' ? $url['host'].':'.$url['port'] : $url['host'];    
     if($referer_host != $_SERVER['HTTP_HOST'])    
     {    
        header_status_404();    
     }    
     }    
     }    
     
     global_inject_input($_POST, array('%0d%0a'));    
     global_inject_input($_REQUEST, array('%0d%0a'));    
     }    
     
     /**    
      * 全局安全过滤函数    
      */    
     function global_inject_input($string, $inject_string, $replace = false)    
     {    
     if(!is_array($string))    
     {    
     foreach($inject_string as $value)    
     {    
     if(stripos(strtolower($string), $value) !== false)    
     {    
                     header_status_404();    
     }    
     }    
     if($replace)    
     {    
     return filter_var(safe_replace($string),FILTER_SANITIZE_STRING);    
     }    
     else    
     {    
        return $string;    
     }    
     }    
     
     foreach($string as $key => $val)    
     {    
     $string[$key] = global_inject_input($val, $inject_string, $replace);    
     }    
     
     return $string;    
     }    
     
     /**    
      * http 头信息    
     **/    
     function header_status_404($status = '404')    
     {    
        if(substr(php_sapi_name(), 0, 3) == 'cgi')    
     {    
        header('Status: '.$status, TRUE);    
        exit;    
     }    
        else    
        {    
     header($_SERVER['SERVER_PROTOCOL'].' '.$status);    
     $error_404 = "\r\n";    
     $error_404 .= "\r\n";    
     $error_404 .= "\r\n";    
     $error_404 .= "\r\n";    
     $error_404 .= "
Object not found!
\r\n";    
     $error_404 .= "
the requested url was not found on this server!~

							

								
								

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\r\n";    
     $error_404 .= "
Error 404
";    
     echo $error_404;    
     exit;    
     }    
     }    
     
     /**    
      * 安全过滤函数    
      *    
      * @param $string    
      * @return string    
      */    
     function safe_replace($string)    
     {    
     $string = str_replace('%20', '', $string);    
     $string = str_replace('%27', '', $string);    
     $string = str_replace('%2527', '', $string);    
     $string = str_replace('*', '', $string);    
     $string = str_replace('"', '"', $string);    
     $string = str_replace("'", '', $string);    
     $string = str_replace('"', '', $string);    
     $string = str_replace(';', '', $string);    
     $string = str_replace('<', 'zuojiankuohaophpcn', $string);    
     $string = str_replace('>', 'youjiankuohaophpcn', $string);    
     $string = str_replace("{", '', $string);    
     $string = str_replace('}', '', $string);    
     return $string;    
     }

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