php中过滤非法字符的具体实现

复制代码 代码如下:

<?php
class sqlsafe {
private $getfilter = "'|(and|or)//b.+?(>|<|=|in|like)|/////*.+?//*///|<//s*script//b|//bEXEC//b|UNION.+?SELECT|UPDATE.+?SET|INSERT//s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)//s+(TABLE|DATABASE)";
private $postfilter = "//b(and|or)//b.{1,6}?(=|>|<|//bin//b|//blike//b)|/////*.+?//*///|<//s*script//b|//bEXEC//b|UNION.+?SELECT|UPDATE.+?SET|INSERT//s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)//s+(TABLE|DATABASE)";
private $cookiefilter = "//b(and|or)//b.{1,6}?(=|>|<|//bin//b|//blike//b)|/////*.+?//*///|<//s*script//b|//bEXEC//b|UNION.+?SELECT|UPDATE.+?SET|INSERT//s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)//s+(TABLE|DATABASE)";
/**
* 构造函数
*/
public function __construct() {
foreach($_GET as $key=>$value){$this->stopattack($key,$value,$this->getfilter);}
foreach($_POST as $key=>$value){$this->stopattack($key,$value,$this->postfilter);}
foreach($_COOKIE as $key=>$value){$this->stopattack($key,$value,$this->cookiefilter);}
}
/**
* 参数检查并写日志
*/
public function stopattack($StrFiltKey, $StrFiltValue, $ArrFiltReq){
if(is_array($StrFiltValue))$StrFiltValue = implode($StrFiltValue);
if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue) == 1){
$this->writeslog($_SERVER["REMOTE_ADDR"]." ".strftime("%Y-%m-%d %H:%M:%S")." ".$_SERVER["PHP_SELF"]." ".$_SERVER["REQUEST_METHOD"]." ".$StrFiltKey." ".$StrFiltValue);
showmsg('您提交的参数非法,系统已记录您的本次操作！','',0,1);
}
}
/**
* SQL注入日志
*/
public function writeslog($log){
$log_path = CACHE_PATH.'logs'.DIRECTORY_SEPARATOR.'sql_log.txt';
$ts = fopen($log_path,"a+");
fputs($ts,$log."/r/n");
fclose($ts);
}
}
?>