问题描述：

I have custom coded a form in WordPress, and I am using PHP to handle the submission.

I followed this tutorial, Handling POST Requests the WordPress Way, but on submit I am presented with a blank web page.

Here is my HTML code:

<form method=\"post\" action=\"<?php echo esc_url(admin_url(\'admin-post.php\')); ?>\">
<input type=\"hidden\" name=\"action\" value=\"newsletter_signup\"/>
<label for=\"newsletterEmail\">Email:</label>
<input type=\"email\" name=\"newsletterEmail\" required/>
<button type=\"submit\" name=\"newsletterSubmit\" value=\"Submit\">
</form>

Here is my PHP code:

function m_newsletter_signup() {
if (!empty($_POST)) {
$newsletterEmail = $_POST[\'newsletterEmail\'];
$to = \'contact@example.com\';
$subject = \'Newsletter Signup\';
$body = \"Email: $newsletterEmail\";
$from = \'Website\';
if ($_POST[\'newsletterSubmit\']) {
if (mail ($to, $subject, $body, $from)) {
header(\"Location: https://example.com/site/newsletter-success/\");
exit();
} else {
header(\"Location: https://example.com/site/newsletter-error/\");
exit();
}
}
}
}
add_action(\'admin_post_nopriv_newsletter_signup\', \'m_newsletter_signup\');
add_action(\'admin_post_newsletter_signup\', \'m_newsletter_signup\');

My form is contained within a .php file within an \"inc\" folder, and my PHP is contained within functions.php.

I have tried the following:

• Setting WP_DEBUG within wp-config.php to true (I got zero errors); and
• I created an \"action\" folder with a \"newsletter.php\" file inside it, and changed the action on my form to /action/newsletter.php, but again, I just got the blank web page (this approach worked fine when I tested it on a static website, one without WordPress).

Also, in case it is of relevance, here is a brief overview of the folder structure:

theme
action
newsletter.php
assets
inc
form.php
functions.php

Any advice would be greatly appreciated.

Thanks,

Matthew

P.S. I do not wish to use a plugin as an alternative.

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