PHP session_start()错误？

Question

可能重复:
已发送PHP标头

所以我刚刚加入Hostgator.com,并且想知道,为什么我总是会收到这个错误:

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/kapip/public_html/main/mainpage.php:5) in /home/kapip/public_html/main/mainpage.php on line 7

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/kapip/public_html/main/mainpage.php:5) in /home/kapip/public_html/main/mainpage.php on line 7

这是什么意思？我知道我可能要编辑php.ini,但我不知道该改变什么.谁能帮我吗？谢谢!

Answer 1

session_start()例如,在做之前,请确保没有任何空白或其他任何显示

// whitespace, any mark up or include that displays something <HERE>
// it will give you that error
<?php
session_start();