以下错误是怎么回事哦?Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at d:\PHP\esseever\manage\Manage.php:1) in d:\PHP\esseever\manage\Manage.php on line 2Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at d:\PHP\esseever\manage\Manage.php:1) in d:\PHP\esseever\manage\Manage.php on line 2
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以下为代码:<?php session_start();
if($_SESSION['adminname']=='')
{
echo "<script>alert('Please Login First');location.href='login.php';</script>";
}
?>这样都不行啊???还要怎么最前??
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以下为代码:<?php session_start();
if($_SESSION['adminname']=='')
{
echo "<script>alert('Please Login First');location.href='login.php';</script>";
}
?>这样都不行啊???还要怎么最前??
?>
如果$_SESSION是空的那么不存在索引adminname
所以直接用会提示错误,而提示的错误会在session_start()之前发出,所以会有上面的错误
要判断一个值是不是空,楼主的写法显然不妥
正确 应该用 isset()或者empty()来判断,否则会有错误提示
存有数据:0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/$level=0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/
$level_array=explode("/",$file);具体请查看
http://cn2.php.net/manual/zh/function.explode.php
if($_SESSION['adminname']=='')
{
echo "<script>alert('Please Login First');location.href='login.php';</script>";
}
?>
这个错误呢??怎么回事