帮我找找这段在线代码的错误

[ahxiao]

//+-----------add guests to online file-----------------
function add_guest() {


global $timestamp,$ip,$online_limit,$forumid,$browser,$opersys;


$onlinefile="../data/online.php";
if(file_exists($onlinefile)){

$data=file($onlinefile);
foreach($data as $datadetail){
$dataline=explode("|",$datadetail);
if(($dataline[1]-$timestamp)<=$online_limit&&$dataline[2]!=$ip){
$newdata[]=$datadetail;
}
}
$newguest="guest|".$timestamp."|".$ip."|||"."\n";
$newdata[]=$newguest;
}
else $newdata[]=$newguest;

$fp=fopen($onlinefile,"w");
flock($fp,LOCK_EX);
for($a=0;$a<count($newdata);$a++){
fwrite($fp,$newdata[$a]."\n");
}
fclose($fp);

##writetofile($onlinefile,$newdata);
}



调试了好久，一直没法正确。
得出这样错误的结果online.php

引用

guest|1028447073|127.0.0.
|1028447073|127.0.0.1|0||

刷新

引用

guest|1028447073|127.0.0.
guest|1028447180|127.0.0
guest|1028447181|127.0.
|1028447181|127.0.0.1|0||