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
- headers_sent() - Checks if or where headers have been sent
- header() - Send a raw HTTP header
- setcookie() - Send a cookie
- apache_response_headers() - Fetch all HTTP response headers
- http_response_code() - Get or Set the HTTP response code
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