PHP headers_list()Functions
Complete PHP HTTP Reference Manual
Definition and Usage
The headers_list() function returns a list of response headers that have been sent (or are to be sent).
This function returns an array containing the headers.
Syntax
headers_list()
Tips and Notes
Tip:To determine whether headers have been sent, use the headers_sent() function.
Example 1
<?php
setcookie("TestCookie","SomeValue"');
header("X-Sample-Test: foo");
header('Content-type: text/plain');
?>
<html>
<body>
<?php
// What headers are to be sent?
var_dump(headers_list());
?>
</body>
</html>
setcookie("TestCookie","SomeValue"');
header("X-Sample-Test: foo");
header('Content-type: text/plain');
?>
<html>
<body>
<?php
// What headers are to be sent?
var_dump(headers_list());
?>
</body>
</html>
The above code will output:
array(4)
{
[0]=> string(23) "X-Powered-By: PHP/5.1.1"
[1]=> string(19) "Set-Cookie: TestCookie=SomeValue"
[2]=> string(18) "X-Sample-Test: foo"
[3]=> string(24) "Content-type: text/plain"
}
{
[0]=> string(23) "X-Powered-By: PHP/5.1.1"
[1]=> string(19) "Set-Cookie: TestCookie=SomeValue"
[2]=> string(18) "X-Sample-Test: foo"
[3]=> string(24) "Content-type: text/plain"
}
Complete PHP HTTP Reference Manual Other Extensions