AffiliateWP - Send the affiliate registration admin email to different email address, or multiple email addresses.

1.php

<?php

/**
 * Send admin notification to a different email address
 */
function affwp_custom_registration_admin_email( $email ) {
  // add the email here
  $email = 'email@yourdomain.com';

  return $email;
}
add_filter( 'affwp_registration_admin_email', 'affwp_custom_registration_admin_email' );

2.php

<?php

/**
 * Send admin notification to multiple email addresses
 */
function affwp_custom_registration_admin_email( $email ) {
  // add the emails to the array here
  $email = array( 'email@yourdomain.com', 'someone@anotherdomain.com' );

  return $email;
}
add_filter( 'affwp_registration_admin_email', 'affwp_custom_registration_admin_email' );

3.php

<?php

/**
 * Send admin notification to the admin, as well as other email addresses
 */
function affwp_custom_registration_admin_email( $email ) {
  // add the emails to the array here
  $email = array( get_option( 'admin_email' ), 'email@yourdomain.com', 'someone@anotherdomain.com' );

  return $email;
}
add_filter( 'affwp_registration_admin_email', 'affwp_custom_registration_admin_email' );

Whenever I implement this code, my entire website goes white and I have to go through the Cpanel to return the functions file to its previous state. Are there are reasons why this might need to be updated?