<?php

// Set the URL of the TikTok video that you want to download
$url = 'https://www.tiktok.com/@username/video/1234567890';

// Use file_get_contents() to fetch the HTML of the TikTok page
$html = file_get_contents($url);

// Use a regular expression to extract the video URL from the HTML
preg_match('/playAddr: "(https:\\/\\/.+?)"/', $html, $matches);
$video_url = $matches[1];

// Use file_put_contents() to save the video file to your server
$video = file_get_contents($video_url);
file_put_contents('video.mp4', $video);

?>