Warning: session_start() [function.session-start]: Cannot send session cache limiter解决方法

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();

<?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\'; 
/* http://www.manongjc.com/article/1270.html */
function close() 
    { 
        if(session_id()!==\'\') 
            @session_write_close(); 
    } 
?> 
<a href=\"index2.php\" >index2</a>