错误提示： Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

原因：在session_start()之前如果有输出内容，会出错，

解决办法：在session_start()之前加上ob_start();

index.php

复制代码 代码如下:

<?php

error_reporting(-1);

ob_start();//不加会出错，无法写入session

register_shutdown_function('close');

echo 1;

session_start();

$_SESSION['password']='mima2ddddddddddddddda2';

function close()

{

if(session_id()!=='')

@session_write_close();

}

?>

<a href="index2.php" >index2</a>

index2.Php

复制代码 代码如下:

<?php

error_reporting(-1);

ob_start();//不加会出错，无法读取session

?

echo 1;

session_start();

echo $_SESSION['password'];

var_dump($_SESSION);

?>

<a href="index.php" >index</a>