CMV #2

functions.php

<?php
add_action( 'wp_ajax_add_notifier_email', 'add_notifier_email');
function add_notifier_email() {
    $post_id = (int)$_POST['company_id'];
    $email = sanitize_email($_POST['email']);

    if (is_numeric($post_id) && $email) {
        $emails = get_field('email_notifiers', $post_id);
        
        $emails[] = array(
            'email' => $email,
        );
        
        update_field('email_notifiers', $emails, $post_id);
        
        $res = array(
            'status' => 'ok',
            'message' => 'e-mail has been saved',
        );
    } else {
        $res = array(
            'status' => 'error',
            'message' => 'Check company id and/or email',
        );
    }

    echo json_encode($res);
    wp_die();
}