You can’t pass arguments to wp_ajax_
callbacks. You need to pass the data via the data
property of the AJAX request. Then you get those values with $_POST
and pass them to a function:
function newsletterSignupAjax() {
$id = $_POST['id'];
$source = $_POST['source'];
/* Make sure to validate and sanitize those values. */
newsletterSignup( $id, $source );
}
add_action('wp_ajax_nopriv_newsletter_signup', 'newsletterSignupAjax');
add_action('wp_ajax_newsletter_signup', 'newsletterSignupAjax');
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