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Creepy Warning


munchigum
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Using PHP and MySQL I made a login script with two pages. But for some reason I keep getting this error:

Warning: Cannot modify header information - headers already sent by (output started at /head.php:18) in index.php on line 10

 

Warning: Cannot modify header information - headers already sent by (output started athead.php:18) in index.php on line 11

 

Warning: Cannot modify header information - headers already sent by (output started athead.php:18) in index.php on line 25

 

Warning: Cannot modify header information - headers already sent by (output started at head.php:18) in /index.php on line 26

 

Does anyone know what the warning is trying to tell me?

 

BTW All the mentioned lines are setting cookies.

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... but that involves reading ... ;D

 

but you referred the OP to articles, which involve more reading. Reading is an important factor in learning.

Yes this is caused by output being sent to the browser before setcookie() is being called. If there is no "seen" output being sent, the text editor you are using could be using a BOM (Byte Order Mark) for encoding.

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