unifi-php-api/examples/auth_guest_basic.php

<?php
/**
 * PHP API usage example
 *
 * contributed by: Art of WiFi
 * description:    example PHP script to perform a basic auth of a guest device
 */

/**
 * 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 MAC address of the device to authorize
 */
$mac = '<enter MAC address of guest device to auth>';

/**
 * the MAC address of the Access Point the guest is currently connected to, enter null (without quotes)
 * if not known or unavailable
 *
 * NOTE:
 * although the AP MAC address is not a required parameter for the authorize_guest() function,
 * adding this parameter will speed up the initial authorization process
 */
$ap_mac = '<enter MAC address of Access Point>';

/**
 * the duration to authorize the device for in minutes
 */
$duration = 2000;

/**
 * The site to authorize the device with
 */
$site_id = '<enter your site id here>';

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

$set_debug_mode = $unifi_connection->set_debug($debug);
$loginresults   = $unifi_connection->login();

/**
 * then we authorize the device for the requested duration
 */
$auth_result = $unifi_connection->authorize_guest($mac, $duration, null, null, null, $ap_mac);

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