PHP headers_list() function usage and example

PHP HTTP 　Reference Manual

The headers_list() function returns the sent HTTP response headers (or those ready to be sent)

Syntax

array headers_list ( void )

Definition and Usage

　The headers_list() function returns the list of HTTP headers ready to be sent to the browser/client. Check if headers have already been sent using headers_sent().

Return value

　Returns the array of header indices.

Online Example

<?php
/*　The setcookie() function will automatically add a response header　*/
setcookie('foo',　'bar');
/*　Add custom response headers　*/
　Most clients will ignore it actively　*/
header("X-Sample-Test:　foo");
/*　Specify plain text content in the response　*/
header('Content-type:　text/plain');
/*　What headers will be sent?　*/
var_dump(headers_list());
?>

Output result：

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"
}

PHP HTTP 　Reference Manual