PHP session_start() error?

Question

Possible Duplicate:
PHP headers already sent

So I just joined Hostgator.com, and was wondering, why do I always get this error:

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

What does this mean? I know I have to probably edit the php.ini, but I'm not sure what to change. Can anyone help me out? Thank you!

yes. you are sending some output out of `` and `?>` before `session_start()` or possibly in the files that file `include`s. — ahmet alp balkan, May 15 '11 at 00:39

score 7 · Accepted Answer · answered May 15 '11 at 00:37

7

Make sure you don't have any whitespace or anything else displayed before you do session_start() e.g.

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

answered May 15 '11 at 00:37

tradyblix

7,439
3
25
29

Ill accept your answer once the time wait is up. Thank you! – May 15 '11 at 00:40

score 2 · Answer 2 · answered May 15 '11 at 00:38

2

This is a common problem. The call to session_start must happen before the first HTML tag or echo statement.

Incorrect:

<html>
<?php session_start() ?>

Correct:

<?php session_start() ?>
<html>

answered May 15 '11 at 00:38

Sam Magura

850
8
18

Not just HTML tags. Any output, including whitespace. – Lightness Races in Orbit May 29 '11 at 02:09

score 0 · Answer 3 · answered May 15 '11 at 00:40

0

Headers cannot be sent after output has started. Therefore, you should check /home/kapip/public_html/main/mainpage.php line 5 (which was indicated by the error message) for anything that results in output.

answered May 15 '11 at 00:40

AndersTornkvist

2,610
20
38

PHP session_start() error?

3 Answers3

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