Tips and Tricks
Causes for php Warning: Cannot modify header information - headers already sent
You will not get this error as long as you don't edit the php File created by Arclab Web Form Builder!
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
BOM (Byte-Order-Mark ) in utf-8 encoded php files
<?php
...
header('Location:
http://...');
?>
Solution:
Change the file encoding to "without BOM" (e.g. using notepad++) or remove the BOM before <?php using a HEX editor
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
