The “Cannot modify header information – headers already sent” error is incredibly common, and I receive many many questions from all over about what it is and what caused it. So let’s clear all of this up once and for all.Upon doing a Google search for this error, I found many helpful articles, but none that were quite helpful enough – they give tips, but some of the details were a bit fuzzy.
But there are lots of useful solutions for this problem -
Echo before header
<?php
echo "hello world"
...
header('Location: http://...');
?>
Solution:
RemoveRemove the echo before header
Use ob_start(); and ob_end_flush(); for buffered output
New-line characters or spaces before <?php
<?php
... header('Location: http://...');
?>
Solution:
Remove everything before <?php
Header Location in mixed php/HTML
<html>
...
<body>
...
<?php header('Location: http://...'); >
...
</body>
</html>
Sorry, you cannot use header-location here, because the header and the HTML code have already been sent!
Empty lines, chars or spaces after ?> when using an php include file
<?php
...
?>
...
...
Solution:
Remove everything after ?> in the php include file
or
This normally can be resolved by a quick custom php.ini alteration:
1) Create a custom php.ini file (if there isn’t one already)
For information on how to create a custom php.ini file, please use other source.
2) Locate the line that looks like:
output_buffering = Off
3) Change the output_buffering line to:
output_buffering = On
This should be all that is needed to bring the site back online.
Cannot modify header information - headers already sent
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