headers_list Returns a list of response headers sent (or ready to send) arrayheaders_list headers_list will return a numerically indexed array of headers to be sent to the browser / client. To determine whether or not these headers have been sent yet, use headers_sent. ]]> this will output : string(29) "X-Powered-By: PHP/5.0.0" [1]=> string(19) "Set-Cookie: foo=bar" [2]=> string(18) "X-Sample-Test: foo" [3]=> string(24) "Content-type: text/plain" } ]]> See Also: headers_sent, header, and setcookie.