WordPress: Disable new user registration email

admin-email.php

<?php

/**
 * Admin emails
 */

function dt_disable_new_user_registation_email() {

    remove_action('register_new_user', 'wp_send_new_user_notifications');
    remove_action('edit_user_created_user', 'wp_send_new_user_notifications', 10, 2);

    add_action('register_new_user', 'dt_wp_send_new_user_notifications');
    add_action('edit_user_created_user', 'dt_wp_send_new_user_notifications', 10, 2);

}
add_action('init', 'dt_disable_new_user_registation_email');


function dt_wp_send_new_user_notifications($user_id, $notify = 'user') {
    wp_new_user_notification($user_id, null, $notify);
}