Finds all YouTube and YT Music IDs and create playlist links

youtube-id-parser.php

<?php
$matches = [];
$content = file_get_contents('inputfile.txt');
$pattern = '#.*http[s]?:\/\/(music\.)?youtube\.com\/watch\?v=([[:alnum:]_-]{4,18}).*#';

preg_match_all($pattern, $content, $matches);

echo count($matches[2])." Videos found\n\n";
$chunks = array_chunk($matches[2], 50);

foreach ($chunks as $ids) {
    echo "https://www.youtube.com/watch_videos?video_ids=".implode(',', $ids)."\n\n";
}