worker.php

<?php

$worker = new GearmanWorker();
$worker->addServer('gearman');
$worker->addFunction('getTemp', 'getTemp');

print "Waiting for a job...\n";
while($worker->work()) {
    if ($worker->returnCode() !== GEARMAN_SUCCESS) {
        print 'Exiting with return code: ' . $gmworker->returnCode();
        break;
    }
}

function getTemp($job) {

    $ch = curl_init();

    $payload = json_decode($job->workload());
    print "Getting current temperature for {$payload->city}...\n";
    $city = urlencode($payload->city);

    $api_key = $_ENV['API_KEY'] ?? false;
    if (!$api_key) {
        return 'No API key';
    }
    curl_setopt_array($ch, array(
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_URL => "http://api.openweathermap.org/data/2.5/weather?q=$city,us&appid=$api_key"
    ));
    $result = json_decode(curl_exec($ch));

    return round((($result->main->temp - 273.15) * 1.8) + 32);
}