Error Cannot modify header information - headers already sent by output started at some file php 12 in some file php on line 23

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When running my script, I am getting several errors like this:

Warning: Cannot modify header information - headers already sent by (output started at /some/file.php:12) in /some/file.php on line 23

The lines mentioned in the error messages contain header() and setcookie() calls.

What could be the reason for this? And how to fix it?

Sep 16, 2020 in PHP by kartik
• 37,490 points
865 views

1 answer to this question.

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Hello @kartik,

This error message gets triggered when anything is sent before you send HTTP headers. Common reasons for outputting something before the HTTP headers are:

Accidental whitespace, often at the beginning or end of files, like this:

 <?php
// Note the space before "<?php"
?>

To avoid this, simply leave out the closing ?> - it's not required anyways.

Hope it helpss!!
ThanK you!!

answered Sep 16, 2020 by Niroj
• 82,560 points

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