unifi-php-api/examples/create_site.php

<?php
/**
 * PHP API usage example
 *
 * contributed by: Art of WiFi
 * description:    example basic PHP script to create a new site, returns true upon success
 */

/**
 * using the composer autoloader
 */
require_once 'vendor/autoload.php';

/**
 * include the config file (place your credentials etc. there if not already present)
 * see the config.template.php file for an example
 */
require_once 'config.php';

/**
 * the site to use to log in to the controller
 */
$site_id = '<short site name of a site the credentials used have access to>';

/**
 * description of the new site
 */
$description = 'new site';

/**
 * initialize the UniFi API connection class and log in to the controller and do our thing
 */
$unifi_connection = new UniFi_API\Client(
    $controlleruser,
    $controllerpassword,
    $controllerurl,
    $site_id,
    $controllerversion
);

$loginresults = $unifi_connection->login();
$results      = $unifi_connection->create_site($description);

/**
 * provide feedback in json format
 */
echo json_encode($results, JSON_PRETTY_PRINT);