headers_list
    (PHP 5)
headers_list -- Returns a list of response headers sent (or ready to send)
Description
array 
headers_list ( void  )
     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().
    
     
| 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());
 
 ?>
 | 
 
       this will output :
       | array(4) {
  [0]=>
  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().