PHP implementation to obtain the header sent to the user

How does PHP obtain the header sent to the user? This article mainly introduces the method of php to obtain the header information sent to the user, using the headers_list function in php. I hope to be helpful.

The example in this article describes how PHP obtains the header information sent to the user. Share it with everyone for your reference. The specific analysis is as follows:

The headers_list function has no parameters and returns an array. The returned array contains a numerical index table containing the header information to be sent to the client

<?php
  header("Expires: Sat, 12 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>";
?>

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