从360提供的PHP防SQL注入代码改成的一个类

<?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."
");
		fclose($ts);
	}
}
?>