NASA APOD API example with Memcached

nasa.apod.php

<?php

/**
 * Example of the NASA APOD API with Memcached
 *
 * @see https://api.nasa.gov/api.html#apod
 * @see http://php.net/manual/en/class.memcached.php
 *
 * Since it is working with the `DEMO_KEY` rate limits
 * are very low, and can be see in the RESPONSE headers, e.g.:
 *
 *  X-RateLimit-Limit: 40
 *  X-RateLimit-Remaining: 31
 *
 * For more information see:
 *
 * @see https://api.nasa.gov/api.html#web-service-rate-limits
 */

require_once dirname(__DIR__) . '/vendor/autoload.php';

use GuzzleHttp\Client;
use GuzzleHttp\Psr7;
use GuzzleHttp\Exception\RequestException;

try {

    $media      = ''; # initialize empty item
    $entry      = ''; # initialize empty item
    $api_key    = 'DEMO_KEY';
    $apod_token = 'nasa_planetary_apod';

    $cache = new Memcached;
    $cache->setOption(Memcached::OPT_DISTRIBUTION, Memcached::DISTRIBUTION_CONSISTENT);
    $cache->addServer('127.0.0.1', 11211);

    /**
     * Check if the apod exists in the cache
     */
    if( ! ($apod = $cache->get($apod_token)))
    {
        /**
         * If the item is not found in the cache
         * then make request to the remote resource
         * and push it to the cache system
         */
        if(Memcached::RES_NOTFOUND == $cache->getResultCode())
        {
            $client = new Client(['base_uri' => 'https://api.nasa.gov/'
                                , 'timeout'  => 2.0
                                , 'connect_timeout' => 2.0]);

            $response = $client->request('GET'
                                       , '/planetary/apod'
                                       , ['query' => ['api_key' => $api_key]]);

            /**
             * If the response code is OK then save
             * the input to Memcached for 1 hour
             *
             * The contents will be in JSON format
             */
            if(200 == $response->getStatusCode())
            {
                $apod = $response->getBody()->getContents();
                $cache->set($apod_token, $apod, 3600);
            }
        }
    }

    /**
     * Unserialize the JSON to make an Object
     */
    $apod = json_decode($apod);

    if(TRUE === is_object($apod))
    {
        $template = <<<'EOD'
    <article>
        <header>
            <h2 class="text-center">Astronomy Picture of the Day</h2>
        </header>

        <figure>
            <!-- media -->
            %5$s

            <figcaption>
                <header>
                    <p>%1$s</p>
                    <h1>%2$s <small>&copy; %3$s</small></h1>
                </header>

                <main>
                    <p>%4$s</p>
                </main>

                <footer>
                    <p>More at <a href="%6$s">%6$s</a></p>
                </footer>
            </figcaption>
        </figure>
    </article>
EOD;

        if('image' == $apod->media_type)
        {
            $media_template = <<< 'EOD'
            <a href="%s"><img src="%s" alt="%s"></a>
EOD;
            $media = sprintf($media_template, $apod->hdurl, $apod->url, $apod->title);
        }

        elseif('video' == $apod->media_type)
        {
            $media_template = <<< 'EOD'
            <iframe width="960" height="540" src="%s"></iframe>
EOD;
            $media = sprintf($media_template, $apod->url);
        }

        $date = (new IntlDateFormatter(Locale::getDefault(),
                     IntlDateFormatter::LONG,
                     IntlDateFormatter::LONG,
                     date_default_timezone_get(),
                     IntlDateFormatter::GREGORIAN))->format(new DateTime($apod->date));

        $data = [$date
               , mb_convert_case($apod->title, MB_CASE_TITLE, "UTF-8")
               , $apod->copyright
               , $apod->explanation
               , $media
               , 'http://apod.nasa.gov/apod/astropix.html'];

        $entry = vsprintf($template, $data);
    }

}

catch(RequestException $e) {
    $entry = "<pre>[REQUEST]\n" . Psr7\str($e->getRequest());
    if($e->hasResponse())
        $entry .= "\n[RESPONSE]\n" . Psr7\str($e->getResponse());
    $entry .= "</pre>";
}

catch(Exception $e) {
    $entry  = "<pre>[ERROR]\n" . $e->getMessage();
    $entry .= "</pre>";
}

?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Nasa APOD API</title>
    <style type="text/css">
        * { margin:0; padding:0; box-sizing:border-box; } body { color:#474A48; background-color:#E8E9EB; } a { text-decoration:none; color:#2467af; } .main { width:1000px; margin:50px auto; padding:20px; background-color:#FFF; box-shadow: 4px 4px 2px #A2AEBB; } article > * { margin:.5rem 0 1rem; } figcaption > * { margin:1rem 0; } figcaption > main { margin:1rem 0 2rem; } h1, h2 {line-height:1.4; font-weight:300; font-size:1.6rem; font-family:Verdana, Arial, sans-serif;} h1 > small {display: block; font-size:.7em; line-height:1.5; } main > p { font-size:1.2rem; margin:20px 0;} footer {border-top:1px dashed #474A48; line-height:1.4; padding:.5rem .2rem; font-family:Verdana, Arial, sans-serif; font-size:.8rem;} .text-center {text-align:center;} </style>
</head>
<body>

    <main class="main">
    <?php
        print $entry;
    ?>
    </main>
</body>
</html>