Twitch CustomAPI - YouTube Chan's Subs, Views, Videos, Last

<?php
// Available commands (link, subs, views, videos, last, last3, date, datetime, datediff, datetimediff)
// obtain your own API key at
// https://console.developers.google.com
$MyKey = xxxxx_xxxxx_xxxxx;
// Convert the GET data into variables.
$YouTubeID = $_GET["Channel_ID"];
$Command = $_GET["Command"];
$User = $_GET["User"];


// Get the channel ID and Upload ID from the YouTube name inputted
$IDs = json_decode(@file_get_contents("https://www.googleapis.com/youtube/v3/channels?part=contentDetails&id=$YouTubeID&key=$MyKey"), true);
if($IDs['items'][0]['id'] == null)
{
    echo 'No such YouTube channel exists.';
    die();
}
// Set variables.
$Channel_ID = $IDs['items'][0]['id'];
$Uploads_ID = $IDs['items'][0]['contentDetails']['relatedPlaylists']['uploads'];

// Get the Subscribers, views and videos.
$ChannelInfo = json_decode(@file_get_contents("https://www.googleapis.com/youtube/v3/channels?part=contentDetails%2C+statistics%2Csnippet&id=$Channel_ID&key=$MyKey"), true);
// Set variables.
$CorrectName = $ChannelInfo['items'][0]['snippet']['title'];

$ViewSubsDenied = $ChannelInfo['items'][0]['statistics']['hiddenSubscriberCount'];
$TotalSubs = $ChannelInfo['items'][0]['statistics']['subscriberCount'];
$NextSub = number_format($TotalSubs) + 1;
$TotalViews = $ChannelInfo['items'][0]['statistics']['viewCount'];
$TotalVideos = $ChannelInfo['items'][0]['statistics']['videoCount'];

$CreatedDate = date('Y-m-d', strtotime($ChannelInfo['items'][0]['snippet']['publishedAt']));
$CreatedDateTime = date('Y-m-d H:i:s', strtotime($ChannelInfo['items'][0]['snippet']['publishedAt']));

// Get the last3 video uploaded.
$Last3Videos = json_decode(@file_get_contents("https://www.googleapis.com/youtube/v3/playlistItems?playlistId=$Uploads_ID&key=$MyKey&fields=items&part=snippet&maxResults=3"), true);
// Get the last video uploaded.
$LastVideo = json_decode(@file_get_contents("https://www.googleapis.com/youtube/v3/playlistItems?playlistId=$Uploads_ID&key=$MyKey&fields=items&part=snippet&maxResults=1"), true);
// Set variable.
$Last3VideosURL = $Last3Videos['items'][0]['snippet']['resourceId']['videoId'];
$Last3VideosTitle = $Last3Videos['items'][0]['snippet']['title'];
$Last2VideosURL = $Last3Videos['items'][1]['snippet']['resourceId']['videoId'];
$Last2VideosTitle = $Last3Videos['items'][1]['snippet']['title'];
$Last1VideosURL = $Last3Videos['items'][2]['snippet']['resourceId']['videoId'];
$Last1VideosTitle = $Last3Videos['items'][2]['snippet']['title'];
$LastVideoURL = $LastVideo['items'][0]['snippet']['resourceId']['videoId'];
$LastVideoTitle = $LastVideo['items'][0]['snippet']['title'];

// Figure out what to display, and display it.
if($Command == "link")
{
    echo $User . ": You can be " . $CorrectName . "'s NEXT " . number_format($NextSub) . " YouTube Subscriber right now! Subscribe to " . $CorrectName . "'s YouTube URL: https://www.youtube.com/channel/" . $YouTubeID . "?sub_confirmation=1";
}
if($Command == "subs")
{
    if($ViewSubsDenied == "true")
    {
        echo $CorrectName . ' has hidden their number of subscribers!';
    }
    else
    {
        echo $CorrectName . ' has ' . number_format($TotalSubs) . ' YouTube Subscribers!';
    }
}
if($Command == "views")
{
    echo $CorrectName . ' has a total of ' . number_format($TotalViews) . ' YouTube Videos Views.';
}
if($Command == "videos")
{
    echo $CorrectName . ' has ' . number_format($TotalVideos) . ' YouTube videos.';
}
if($Command == "last3")
{
    echo $CorrectName . "'s last 3 YouTube videos: ($Last3VideosTitle) youtu.be/" . $Last3VideosURL . " | ($Last2VideosTitle) youtu.be/" . $Last2VideosURL . " | ($Last1VideosTitle) youtu.be/" . $Last1VideosURL;
}
if($Command == "last")
{
    echo $CorrectName . "'s YouTube latest video: ($LastVideoTitle) youtu.be/" . $LastVideoURL;
}
if($Command == "date" || $Command == "datetime" || $Command == "datediff" || $Command == "datetimediff")
{
    echo $CorrectName . ' created their YouTube account on ';
    if($Command == "date" || $Command == "datediff")
    {
        echo $CreatedDate;
        if($Command == "datediff")
        {
            echo ' (';
            echo GetDateDifference($CreatedDate, $Command);
            echo ')';
        }
    }
    if($Command == "datetime" || $Command == "datetimediff")
    {
        echo $CreatedDateTime;
        if($Command == "datetimediff")
        {
            echo ' (';
            echo GetDateDifference($CreatedDateTime, $Command);
            echo ')';
        }
    }
}

// Function to get the date difference.
function GetDateDifference($datetime, $Command)
{
    $now = new DateTime;
    $ago = new DateTime($datetime);
    $diff = $now->diff($ago);

    $diff->w = floor($diff->d / 7);
    $diff->d -= $diff->w * 7;
    if($Command == "datetimediff")
    {
        $string = array
        (
            'y' => 'year',
            'm' => 'month',
            'w' => 'week',
            'd' => 'day',
            'h' => 'hour',
            'i' => 'minute',
            's' => 'second',
        );
    }
    if($Command == "datediff")
    {
        $string = array
        (
            'y' => 'year',
            'm' => 'month',
            'w' => 'week',
            'd' => 'day',
        );
    }
    foreach ($string as $k => &$v) {
        if ($diff->$k) {
            $v = $diff->$k . ' ' . $v . ($diff->$k > 1 ? 's' : '');
        }
        else
        {
            unset($string[$k]);
        }
    }
    return $string ? implode(', ', $string) . '' : '';
}
?>

Example:
Youtube.php?Channel_ID=YT_Channel_ID&Command=subs
or
Youtube.php?Channel_ID=YT_Channel_ID&Command=subs&User=username