Get youtube video download URLs

code.php

preg_match("/yt\.setConfig\(\{\s+\'PLAYER_CONFIG\'\:\s(?<config>.*?)\s+\}\)/s", $page, $matches);

$config = json_decode($matches['config']);

$fmts = explode(',', $config->args->url_encoded_fmt_stream_map);

foreach( $fmts as $k => $v ) { parse_str($v, $fmts[$k]); }