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PHP: apache_response_headers

The apache_response_headers() function allows you to obtain some of the HTTP response headers that are sent by the Apache HTTP server; it does not return all the headers, so it might not do what you expect.

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Edited: 2020-09-23 12:03

The apache_response_headers function is used to return certain HTTP response headers that are sent by the Apache web server, but it does not reveal all headers that are controlled by Apache, and therefor may not be very useful.

The function either returns an associative array on success or false on failure; the returned array contains key and value pairs for easy parsing.

Example use:

$apache_headers = apache_response_headers();
var_dump($apache_headers);

Output:

array(2) {
  ["Upgrade"]=>
  string(6) "h2,h2c"
  ["Connection"]=>
  string(7) "Upgrade"
}

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