php session_start() 出错

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







<?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



<?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>