PHP implementation gets the header sent to the user

How does PHP implement getting headers sent to the user? This paper mainly introduces the method of getting the header information sent to the user by PHP, using the Headers_list function in PHP. We hope to help you.

The example in this article describes how PHP gets the header information 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>";? >

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