Link.tl bypass

linktl.api.php

<?php
function linktlCURL($link, $ref) {
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL,$link);
	curl_setopt($ch, CURLOPT_TIMEOUT, 5);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_REFERER, $ref);
	curl_setopt($ch, CURLOPT_COOKIE, "ads_impression=19; ads_impression3=19;");
	curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36");
	$ret = curl_exec($ch);
	curl_close($ch);
	return $ret;
}
function linktlAPI($link) {
	preg_match("/link.tl\/([^&]+)/", $link, $id);
	$id = (isset($id[1])) ? ($id[1]) : (NULL);
	if ($id == NULL)
		return json_encode(["err" => 1, "msg" => "invalid_link"]);

	$get = linktlCURL("http://link.tl/fly/go.php?to={$id}", "http://link.tl/{$id}");
	preg_match_all("/<div class=\"skip_btn2\"><a href=\"(.*)\"/", $get, $target);

	if(!empty($target[1][0])) {
		if(preg_match("/link.tl\/fly\/site.php\?to=([^&]+)/", $target[1][0])) {
			$get = linktlCURL($target[1][0], "http://link.tl/fly/go.php?to={$id}");
			preg_match_all("/<iframe class=\"site_frame\" src=\"(.*)\" scr/", $get, $target);
			return json_encode(["err" => -1, "msg" => $target[1][0]]);
		}
		return json_encode(["err" => 0, "msg" => $target[1][0]]);
	}
	return json_encode(["err" => 2, "msg" => "broken_link"]);
}
echo linktlAPI("http://link.tl/a");
?>