session_start() [function.sessionstart]

 

之前没有加  error_reporting (E_ALL ^ E_WARNING);一直弹的错误都是

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:\AppServ\www\liuyan\post.php:15) in D:\AppServ\www\liuyan\header.php on line 1  

后来 改成

 

<?php
error_reporting (E_ALL ^ E_WARNING);
session_start();
?>

就不弹出了。。