PHP防SQL注入的一個類

<?php
class sqlsafe {
    private $getfilter = "'|(and|or)\b.+?(>|<|=|in|like)|\/\.+?\\/|<\sscript\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)|\/\.+?\\/|<\sscript\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)";
    /**


 * 構造函數
 */
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);}
}
/**
 * 參數檢查并寫日志
 */
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('您提交的參數非法,系統已記錄您的本次操作！','',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);
}

}
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