360提供的PHP防注入代码

PHP代码
<?php
//Code By Safe3
function customError($errno, $errstr, $errfile, $errline)
{
echo "Error number: [$errno],error on line $errline in $errfile
" ;
die();
}
set_error_handler("customError",E_ERROR);
$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)" ;
$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)" ;
$cookiefilter="\b(and|or)\b.{1,6}?(=|>|<|\bin\b|\blike\b)|\/\.+?\\/|<\s*script\b|\bEXEC\b|UNION.+?Select|Update.+?SET|Insert\s+INTO.+?VALUES|(Select|Delete).+?FROM|(Create|Alter|Drop|TRUNCATE)\s+(TABLE|DATABASE)" ;
function StopAttack($StrFiltKey,$StrFiltValue,$ArrFiltReq){
if(is_array($StrFiltValue))
{
$StrFiltValue=implode($StrFiltValue);
}
if (preg_match("/".$ArrFiltReq."/is",$StrFiltValue)==1){

//slog("<br><br>操作IP: ".$_SERVER["REMOTE_ADDR"]."<br>操作时间: ".strftime("%Y-%m-%d %H:%M:%S")."<br>操作页面:".$_SERVER["PHP_SELF"]."<br>提交方式: ".$_SERVER["REQUEST_METHOD"]."<br>提交参数: ".$StrFiltKey."<br>提交数据: ".$StrFiltValue);
print "360websec notice:Illegal operation!" ;
exit();

}
}
//$ArrPGC=array_merge($_GET,$_POST,$_COOKIE);
foreach($_GET as $key=>$value){
StopAttack($key,$value,$getfilter);
}
foreach($_POST as $key=>$value){
StopAttack($key,$value,$postfilter);
}
foreach($_COOKIE as $key=>$value){
StopAttack($key,$value,$cookiefilter);
}
if (file_exists('update360.php')) {
echo "请重命名文件update360.php，防止黑客利用<br/>";
die();
}
function slog($logs)
{
$toppath=$_SERVER["DOCUMENT_ROOT"]."/log.htm";
$Ts=fopen($toppath,"a+");
fputs($Ts,$logs."\r\n");
fclose($Ts);
}