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Editorial Team
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Asked: 2026-05-14T06:14:35+00:00

i need to set cookies in my page, but it returns Warning: Cannot modify

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i need to set cookies in my page, but it returns 

Warning: Cannot modify header information - headers already sent by (output started at /home1/bsam/public_html/24kadr/index.php:1) in /home1/bsam/public_html/24kadr/basic_login.php  on line 35

on line 1 i have 

include 'basic_login.php';

but even if i remoove include, ir returns the same warning on session_start, or mysql_connect.
so i think these all functions use header when calling, but what can i do? at least i need to connect to database, and just after it i need to use setcookie().
so what can i do?
thanks

update the first lines of index.php

<?include 'basic_login.php';include 'settings.php';?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
...........

in basic_login.php it starts

<?
session_start();
include 'connect.php';
ini_set("session.bug_compat_42",1);
ini_set("session.bug_compat_warn",0);

……………………………………

setcookie("cookname", $_SESSION['username'], time()+60*60*24*30, "/");
setcookie("cookpass", $_SESSION['password'], time()+60*60*24*30, "/");
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1 Answer

  1. Editorial Team

    You most likely have white space in /24kadr/index.php before the opening <?php. Remove it and it should be fine.

    If there is no white space, maybe your PHP file was saved with a Byte Order Mark (BOM). In that case, have your editor save the file without it.

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