Thanks for this.
I did some research, tried something based on some examples but some of them are not working.
<?php
// PHP - SUBSCRIBER COUNT USING YOUTUBE API V3
// BY @danielsebesta
// Google Developers: https://console.developers.google.com/apis/?pli=1
// Youtube Channel ID: https://www.youtube.com/account_advanced
$api_key = "AIzaSyBc-UkCwebflDh1pi0rNL7QTP-1Skf8TnU";
$channel_id = "UCfUwyi5dAZ3DuXI8GP9vhUg";
$api_response = file_get_contents('https://www.googleapis.com/youtube/v3/channels?part=statistics&id=' . $channel_id . '&key=' . $api_key . '');
$api_response_decoded = json_decode($api_response, true);
// Subscribers
$subscribers = $api_response_decoded['items'][0]['statistics']['subscriberCount'];
// Videos
$videos = $api_response_decoded['items'][0]['statistics']['videoCount'];
// Views
$views = $api_response_decoded['items'][0]['statistics']['viewCount'];
// Likes
$likes = $api_response_decoded['items'][0]['statistics']['likeCount'];
// Dislikes
$dislikes = $api_response_decoded['items'][0]['statistics']['dislikeCount'];
// Dislikes
$comments = $api_response_decoded['items'][0]['statistics']['commentCount'];
echo $subscribers;
echo "</br></br>";
echo $views;
echo "</br></br>";
echo $likes;
echo "</br></br>";
echo $dislikes;
echo "</br></br>";
echo $comments;
echo "</br></br>";
echo $videos;
?>