unifi-php-api/examples/test_connection.php

<?php
/**
 * Test the connection to your UniFi controller
 *
 * contributed by: Art of WiFi
 * description: PHP script to check/debug the connection to your controller using PHP and cURL
 */

/**
 * Include the config file (place your credentials etc. there if not already present),
 * see the config.template.php file for an example.
 * (will only be used here to get the URL to the controller)
 */
require_once('config.php');

/**
 * Check whether the cURL module supports SSL
 */
if (!curl_version()['features'] & CURL_VERSION_SSL) {
    print 'SSL is not supported with this cURL installation!' . PHP_EOL;
}

/**
 * create cURL resource
 */
$ch = curl_init();

/**
 * Set the required cURL options
 */
curl_setopt($ch, CURLOPT_URL, $controllerurl);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

/**
 * This cURL option can have a value of 0-6
 * see this URL for more details:
 * http://php.net/manual/en/function.curl-setopt.php
 * 0 is the default value and is used by the PHP API client class
 */
curl_setopt($ch, CURLOPT_SSLVERSION, 0);

/**
 * Be more verbose
 */
curl_setopt($ch, CURLOPT_VERBOSE, true);

/**
 * $results contains the output as returned by the cURL request,
 * returns true when successful, else returns false
 */
print 'verbose output from the cURL request:' . PHP_EOL;
$results = curl_exec($ch);

print PHP_EOL . 'curl_getinfo output:' . PHP_EOL;
print_r(curl_getinfo($ch));

/**
 * If we receive a cURL error, output it before the results
 */
if (curl_errno($ch)) {
    print PHP_EOL . 'cURL error: ' . curl_error($ch) . PHP_EOL;
}

print PHP_EOL . '$results:' . PHP_EOL;
print_r($results);
print PHP_EOL;