headers_list

(PHP 5, PHP 7, PHP 8)

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

Description

headers_list(): array

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().

Parameters

This function has no parameters.

Return Values

Returns a numerically indexed array of headers.

Examples

Example #1 Example 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("Example-Test: foo");

/* Specify plain text content in our response */
header('Content-Type: text/plain; charset=UTF-8');

/* What headers are going to be sent? */
var_dump(headers_list());

?>

The above example will output something similar to:

array(3) {
  [0]=>
  string(19) "Set-Cookie: foo=bar"
  [1]=>
  string(17) "Example-Test: foo"
  [2]=>
  string(39) "Content-Type: text/plain; charset=UTF-8"
}

Notes

Note:

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

See Also