header
headers_sent
Network Functions
PHP Manual

# headers_list

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

### Description

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.

### Return Values

Returns a numerically indexed array of headers.

### Examples

Example #1 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"
    }

### Notes

> Note:

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

### See Also

- headers_sent
- header
- setcookie
- apache_response_headers
- http_response_code