Create a WP user when a new booking is made: Shared by a Wappointment user (Gil)

functions.php

<?php

add_action('wappointment_appointment_confirmed', 'my_function');

function my_function($eventObject){

    $client = $eventObject->getClient();
    $email = $client->email;
    $name = $client->name;


    // Check if the user already exists
    $user = get_user_by('email', $email);

    // If user doesn't exist, create a new one
    if (!$user) {

        // Generate a random password
        $password = wp_generate_password();

        // Create the user
        $user_id = wp_create_user($email, $password, $email);

        // Set user first name
        wp_update_user(array('ID' => $user_id, 'first_name' => $name));

        // Set user display name as first name + last name
        $user_data = array(
           'ID' => $user_id,
           'display_name' => $name,
           'user_nicename' => sanitize_title($name)
        );

        wp_update_user($user_data);

        // Send a welcome email to the user
        wp_new_user_notification($user_id, null, 'both');

    }
}