Donation Form Email Check (Advanced)

add_filter('charitable_validate_donation_form_submission_email_check', 'charitable_test_for_email', 10, 2 );

function charitable_test_for_email( $valid, $submitted ) {

	$email = $submitted->get_submitted_value( 'email' );

    if ( ! is_valid_email( $email ) ) {

	   return false;

	}

	return $valid;

}

function is_valid_email($email) {

    // Use PHP's built-in function to split the email into local and domain parts

    $parts = explode('@', $email);

    // Check if the email has a domain part

    if (count($parts) !== 2) {

        return false;  // Invalid email format

    }

    $domain = $parts[1];

    // Check if the word "baddomain" is in the domain

    if (strpos($domain, 'baddomain') !== false) {

        return false;

    }

    return true;

}