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php: header function

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May 28.2007

i receive the following error while using the php header() function and get the following error: how can i remove this error

Warning: Cannot modify header information – headers already sent by (output started at E:Serverhtdocsapaceconn.php:2) in E:Serverhtdocsapaceap_adminap_index.php on line 22

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6 Comments(s) ↴

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@redhatlookMay 28.2007 — You cannot output anything before header() function, that means no echo, no whitespaces no lines, nothing.

For example this code is bad:


echo 'abc';

header('xyz...');
[/QUOTE]
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@mahfoozauthorMay 29.2007 — ok i followed but what is the solution for redirecting a user to login page so that when he/she press [B]browser history back button[/B] then he/she should be on the last visited page rather than to login page as in case of javascirpt redirection
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@redhatlookMay 29.2007 — the best solution is the redirection using PHP of course.. this way


<?php

session_start();

if ($_SESSION['login']=='')

{

header('Location: login.php');

exit;

}

?>
[/QUOTE]
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@mahfoozauthorMay 29.2007 — ok but what's the solution when i use some query to database like

[code=php]select date_of_birth from table where user_id='session_vriable'[/code]

and if data of birth lessthan some value than redirect to 1st page else redirect to 2nd page using header function
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@redhatlookMay 29.2007 — you are developing some erotic site? if age<18 .. ? just kidding.. ?

use something like this..

[CODE]
<?php
// $age is read from db here ..
if ($age<30)
header('Location: under30.php'); else
header('Location: overequal30.php');
exit;
?>
[/CODE]
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@mahfoozauthorMay 30.2007 — thanks but it is just an example query :eek:
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