verify-valid-email.php

<?php

add_filter('forminator_custom_form_submit_errors', 'my_custom_form_validation', 10, 3);

function my_custom_form_validation($submit_errors, $form_id, $field_data_array) {

  // Skip if is not the correct form
  if( (int) $form_id !== 49 ){
    return;
   }

    $fields = [];
    $fields[] = $_POST['email-1'];
    $fields[] = $_POST['email-2'];


      // Check if both emails are the same
      if (count(array_unique($fields)) !== 1) {
        // Custom error
        $submit_errors[][ 'email-2'] = __( 'Emails does not match' );
      }

  // Always return $submit_errors
  return $submit_errors;

}

Thank you for this script.
How can I add multiple form id numbers?

Thank you for this script. How can I add multiple form id numbers?

You can use something like this:

$forms = [1,2,3,4];

// Skip if is not the correct form
if( !in_array( $form_id, $forms ){
return;
}

Reference https://www.php.net/manual/en/function.in-array.php

@patrickfreitasdev Hi Patrick,
I am attempting to use this code you've kindly provided. It works well, except for one thing. The message it displays when the two email addresses don't match is: "Error: Your form is not valid, please fix the errors!"

That's not what I'd like to display, as it's not useful. Is there a way to change this?

Hi @inspiredearth I hope you are doing well.

It is the default behaviour on Forminator, on top of Form it shows the "Error:... " and on the field level it will show what you define at:

$submit_errors[][ 'email-2'] = __( 'Emails does not match' );

However, feel free to open a ticket on wordpress.org > Forminator > Support and we can take a look if this can be changed.

Hi @patrickfreitasdev , Thanks for that info.
It seems to be that the current wording isn't ideal. It makes it sound like there is an error with the form itself.
I suspect it would be clearer and less ambiguous if it stated something like, "Submitted form data is invalid. Check for error messages within the form". Something along those lines.

I'll post a support ticket.