Pass $_POST data between different PHPs

There are at least 3 ways to pass ‘post’ data between scripts except from general processing:

1. write post data to a $_SESSION variable.

   $_SESSION['post'] = $_POST;
   
   header("Location: script.php");
   
   // in script.php, get back the $_POST data by:
   
   $post = $_SESSION['post'];

2. write post data to a middle file:

   $fh = fopen($file, 'w') or die("can't open file");
   fwrite($fh, print_r($_POST, true));
   fclose($fh);
   
   // later, use the following way to get back the $_POST data.
   $post = file_get_contents($file);
   print_r($post);

3. write post data to a middle DB table.

All the above methods should work, which is better? It is hard to say and depends on real environment.