How PHP Gets the header information sent to the user _php tips

This example describes how PHP obtains header information that is sent to the user. Share to everyone for your reference. The specific analysis is as follows:

The Headers_list function has no arguments and returns an array. The returned array contains a numeric index table containing header information to be sent to the client

<?php
  Header ("Expires:sat, Dec 1989 05:30:00 GMT");
  echo "This is some output.<br/>";
  echo "Headers sent are:<br/> <UL>";
  $headers = Headers_list ();
  foreach ($headers as $header) {
    echo <LI> $header </LI>;
  }
  echo "</UL>";
? >

I hope this article will help you with your PHP program design.