防SQL注入的php类库

<?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)";

  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);}

  }

  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);

    }

  }

  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);

  }

}