Scrape Facebook Video Thumbnail

fbthumb.php

<?php
$video_url = $_GET['video_url'];
echo get_fb_thumbnail($video_url);

function get_fb_thumbnail($video_url) {
  $curl = curl_init();

  curl_setopt_array($curl, array(
      CURLOPT_URL => $video_url,
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_ENCODING => "",
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 0,
      CURLOPT_FOLLOWLOCATION => true,
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => "GET",
      CURLOPT_HTTPHEADER => array(
          "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0",
          "Cookie: fr=1ptzcnDkjdXv2IfZZ..Bfu1P7.es.AAA.0.0.Bfu1Qo.AWVKu_WtXv8"
      ),
  ));

  $response = curl_exec($curl);

  curl_close($curl);
  
  $thumbnail_src = "";
  if (preg_match('#<video [^>]+></video>\s*<div [^>]+><img [^>]+src="([^"]+)#s',$response,$matches))
  {
      $image = $matches[1]; 
      $image = str_replace('&amp;','&',$image);
      if (strpos($image,'&')) {
          $thumbnail_src = $image;
      } 
  }
  
  return $thumbnail_src;
}
?>