PHP download zip from external server and unzip

<?php
/*
 1) upload this file into the folder you'd like to extract the content of the downloaded .zip file.
 2) run the script in you browser. i.e. http://localhost/downunzip.php
 3) after the script was executed sucesfully, login thru ftp and remove this script
*/
 /* you can change this */
 $download_url = "https://wordpress.org/latest.zip"; // url to zip file you want to download
 $delete = "no"; // if you DO NOT want the .zip file to be deleted after it was extracted set "yes" to "no".
 /* don't touch nothing after this line */
 $file = "file.zip";
 $script = basename($_SERVER['PHP_SELF']);
 // download the file 
 file_put_contents($file, fopen($download_url, 'r'));
 // extract file content 
 $path = pathinfo(realpath($file), PATHINFO_DIRNAME); // get the absolute path to $file (leave it as it is)
  $zip = new ZipArchive;
 $res = $zip->open($file);
  if ($res === TRUE) {
   $zip->extractTo($path);
   $zip->close();
    echo "<strong>$file</strong> extracted to <strong>$path</strong><br>";
   if ($delete == "yes") { unlink($file); } else { echo "remember to delete <strong>$file</strong> & <strong>$script</strong>!"; }
  } else {
   echo "Couldn't open $file";
 }
?>