headers_list

(PHP 5, PHP 7)

Returns a list of response headers sent (or ready to send)

array headers_list ( void )

headers_list() will return a list of headers to be sent to the browser / client. To determine whether or not these headers have been sent yet, use headers_sent().

Returns:

Returns a numerically indexed array of headers.

Notes:

Headers will only be accessible and output when a SAPI that supports them is in use.

Examples:

Examples using headers_list()

<?php
 
/* setcookie() will add a response header on its own */
setcookie('foo', 'bar');
 
/* Define a custom response header
   This will be ignored by most clients */
header("X-Sample-Test: foo");
 
/* Specify plain text content in our response */
header('Content-type: text/plain');
 
/* What headers are going to be sent? */
var_dump(headers_list());
 
?>

The above example will output:

array(4) {
  [0]=>
  string(23) "X-Powered-By: PHP/5.1.3"
  [1]=>
  string(19) "Set-Cookie: foo=bar"
  [2]=>
  string(18) "X-Sample-Test: foo"
  [3]=>
  string(24) "Content-type: text/plain"
}