The headers_list() function returns a list of response headers sent (or ready to send) to a client.This function returns an array of headers.
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().
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" }
Returns a numerically indexed array of headers.