# PHP Simple Login Header issues

**URL:** <https://forum.kirupa.com/t/php-simple-login-header-issues/275441>\
**Category:** programming\
**Created:** [November 13, 2008, 9:15pm UTC](https://forum.kirupa.com/t/php-simple-login-header-issues/275441 "2008-11-13T21:15:34Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ganessian](https://avatars.discourse-cdn.com/v4/letter/g/7993a0/32.png) [@ganessian](https://forum.kirupa.com/u/ganessian)\
**Post date:** [November 13, 2008, 9:15pm UTC](https://forum.kirupa.com/t/php-simple-login-header-issues/275441/1 "2008-11-13T21:15:34Z")

</div>

Issue Solved! Soulution: Output Buffering. Thanks to icio and mainegate for the help!

hello! I am totally new to PHP, and I am trying to make use of a simple login script, that checks usernames and passwords against a flat text file, but I am encountering an error. I have looked into the use of - header(“Location: [blah.com](http://blah.com)”); and found that it will not work if used after echo, or outputting data (correct?) the header function is called before any echo - Could someone point me in the right direction? here is the code i used, the errors i recieved, a link to the page itself, and a username and password for test.

username: kirupa  
password: test

link: [http://www.thanative.com/eteam/login.php](http://www.thanative.com/eteam/login.php)

The Code:

```php
<?php
if ($_SERVER['REQUEST_METHOD']=="POST"){
// Get UserNames and Passwords.
$Logi = file("users/log.txt");
// Work out how many there are
$size = sizeof($Logi);
// Break apart passwords and usernames
foreach($Logi as $Key => $Val)
{ $Data[$Key] = explode("||", $Val); }
// run through list and see if any match
for($K = 0; $K<$size; $K++)
{
$user = $Data[$K][0];
$pass = $Data[$K][1];
// If match set cookie and redirect.
if ($user == trim(addslashes($_POST["user"])) && $pass == trim(addslashes($_POST["pass"])) )
{ 
 setcookie("in", 1, time()+3600);
 // Start hidden page
 header("Location: www.thanative.com");
}
}
 echo "Login Failed.";
// If you didnt log in show login form
} else { ?>
<div style="width:250px">
<div><strong>Black Sheep E-Team Login</strong></div>
<div><form name="Login" method="post" action="<?=$_SERVER['PHP_SELF'];?>">
  <div align="right">Username:
    <input name="user" type="text" >
      <br>
    Password:
  <input name="pass" type="password" >
  <br>
  <input type="submit" name="Submit" value="Submit">
  </div>
</form>
</div></div>
<?php
}
?>

```

The Errors:

**Warning** : Cannot modify header information - headers already sent by (output started at /home/www/thanative/login.php:8) in **/home/www/thanative/login.php** on line **26**

**Warning** : Cannot modify header information - headers already sent by (output started at /home/www/thanative/login.php:8) in **/home/www/thanative/login.php** on line **27**  
Login Failed.

I would truly appreciate any help you guys could offer with this!