PHP anti-SQL injection code (provided by 360)

/**
* php prevents sql injection
* by bbs.it-home.org
*/
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 $cookiefilter = "\b(and|or)\b.{1,6}?(=|>|<|\bin\b|\blike\b)|\/\*.+?\*\/|<\s*script\b|\bEXEC\b|UNION.+?SELECT|UPDATE.+?SET|INSERT\s+INTO.+?VALUES|(SELECT|DELETE).+?FROM|(CREATE|ALTER|DROP|TRUNCATE)\s+(TABLE|DATABASE)";
 /**
 *Constructor
*/
 public function __construct() {
  foreach($_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);}
 }
 /**
 * Parameter checking and writing logs
*/
 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 injection log
*/
 public function writeslog($log){
  $log_path = CACHE_PATH.'logs'.DIRECTORY_SEPARATOR.'sql_log.txt';
  $ts = fopen($log_path,"a+");
  fputs($ts,$log."rn");
  fclose($ts);
 }
}
?>