How to get videos by ids in Google API 3

youtube.videos.php

<?php
$ids = array(
    'spepfQLXrm4',
    'OmcJbaHw2C8',
    'D0-tHS7GQxM',
);
$key = '<GoogleApiKey>';
$parts = array(
    'contentDetails',
    'snippet',
);
$params = array(
    'id' => implode(',', $ids),
    'key' => $key,
    'part' => implode(',', $parts),
);  
$url = 'https://www.googleapis.com/youtube/v3/videos?'.http_build_query($params);

$curl = curl_init();
curl_setopt ($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$result = curl_exec($curl);
if ($result !== false) {
    $data = json_decode($result, true);
    echo '<pre>'.print_r($data, true).'</pre>';
}
curl_close ($curl);
?>