php - captcha code interfering with form handler



You try to send HTTP header inverify.php:

header('Location: contact-form-thank-you.html');

after sending HTML comment in first line, which is treated as response, from now on sending any headers will issue such warning.

If you really need that comment, put it before<!DOCTYPE or in<body> tag.




Try to remove the spaces after your comment

<!-- begin code for including captcha validation-->    
                                            ^^ Spaces here ^^

If does not solve, you need to remove the comment, and can put inside<?php tag:


// begin code for including captcha validation

[...] // Lots of code

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