刚写了个上传zip文件并解压至指定目录的函数，没时间测试。用linux主机的朋友请帮忙看看有没有错

<?
/**
|+---------------------------------------
| Id: upzip.php
| Copyright:Arvan
| Note:
|	上传zip文件并解压至指定目录
|+---------------------------------------
| 说明：$zipdir为表单传递的file变量
|	   $inputdir为存入目录	
|
| 返回值：解压后文件的存放路径
|+---------------------------------------
**/
function upzip($zipdir, $inputdir){
	if (!is_dir($inputdir)){
		@mkdir($inputdir, 0777);
	}else{
		@chmod($inputdir, 0777) or die("$inputdir　不可写！");
	}
	$arr=explode(".", $zipdir); //$zipdir'name as "name.zip" with only 1 dot
	$firstname=$arr[0];
	$lastname=$arr[1];
	$lastname=strtolower($lastname);
	if ($lastname!="zip"){

print <<<EOT
<script language=javascript>
	alert("请上传zip文件!");
location.href = "javascript:history.back()";
</script>
EOT;
exit();
	}else{
		$fulldir=$inputdir."/".$firstname;
	}

	@mkdir($fulldir, 0777);
	copy($zipdir, $fulldir);
	$unzip=$fulldir."/".$firstname."zip";
	@system("upzip $unzip -d $fulldir");	
	@unlink($unzip);
	$handle=@opendir($fulldir);
	while ($entry = readdir($handle)) {
		$total_size = $total_size+filesize($fulldir."/".$entry);
	}
	@closedir($handle);
	if ($total_size!>0){
print <<<EOTC
<script language=javascript>
	alert("FLASE!");
location.href = "javascript:history.back()";
</script>
EOTC;
exit();	
	}
	@chmod($inputdir, 0755);
	@chmod($inputdir, 0755);
	return $fulldir;
}
?>