用php写的serv-u的web申请账号的程序

<?
//sign.php
//系统适用于win2000
$path="e:\\serv-u\\servudaemon.ini";//用户文件的路径
$fabu="e:\\web\\";//总web路径
if($add)
{
$fp1=fopen($path,"r+");
$str=fread($fp1, filesize($path));
$fp=fopen($path,"a");
flock($fp,3);
$us="=".$userid;
$start=strpos($str,$us);
if($start)
    {
echo "对不起，该用户已经存在";
    }else{
$start1=strpos($str,"user1");
if($start1){
$start=$start1+6;
$end=strpos($str,"|",$start);
$firstusername=substr($str,$start,$end-$start);
$start2=strpos($str,"[user=".$firstusername."|1]");
$usernum=count(split("\r\n",substr($str,$start1,$start2-$start1)));
        }else
        {
$usernum=1;
        }
$userinfo="user".$usernum."=".$userid."|1|0"."\r\n";
$userpath=$fabu.$userid;
@mkdir($userpath,0700);
$maxsize=$size*1024;
$userp="[user=".$userid."|1]"."\r\n";
$userp.="password=".$password."\r\n";
$userp.="homedir=".$userpath."\r\n";
$userp.="relpaths=1"."\r\n";
$userp.="diskquota=1|".$maxsize."|0"."\r\n";
$userp.="maxusersloginperip=2"."\r\n";
$userp.="timeout=600"."\r\n";
$userp.="access1=".$userpath."|rwamlcdp"."\r\n";

if($start2){
$content=substr($str,$start2,strlen($str)-$start2);
$content.=$userp;
$userinfo.=$content;
    fseek($fp1,$start2,seek_set);
    fputs($fp1,$userinfo);
}else
        {
fputs($fp,$userinfo);
fputs($fp,$userp);
        }
//echo $firstusername;
//echo $start;
//echo "<br>";
//echo $end;


            }
fclose($fp);
fclose($fp1);
}
?>



<form method=post action="sign.php">
账号：<input type="text" name="userid" size=10 maxlength=20 ><br>密码：
<input type="password" name="password" size=10 maxlength=20 ><br>空间大小：<input type="text" name="size" size=4 maxlength=4> m<br><input type="submit" name="add" value="增加用户">
</form>