note 125538 added to function.http-response-code

Do not mix the use of http_response_code() and manually setting the response code header because the actual HTTP status code being returned by the web server may not end up as expected. http_response_code() does not work if the response code has previously been set using the header() function. Example: <?php header('HTTP/1.1 401 Unauthorized'); http_response_code(403); print(http_response_code()); ?> The raw HTTP response will be (notice the actual status code on the first line does not match the printed http_response_code in the body): HTTP/1.1 401 Unauthorized Date: Tue, 24 Nov 2020 13:49:08 GMT Server: Apache Connection: Upgrade, Keep-Alive Keep-Alive: timeout=5, max=100 Transfer-Encoding: chunked Content-Type: text/html; charset=UTF-8 403 I only tested it on Apache. I am not sure if this behavior is specific to Apache or common to all PHP distributions. ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.174 (proxied: 184.161.143.67) ---- Manual Page -- http://php.net/manual/en/function.http-response-code.php Edit -- https://master.php.net/note/edit/125538 Del: integrated -- https://master.php.net/note/delete/125538/integrated Del: useless -- https://master.php.net/note/delete/125538/useless Del: bad code -- https://master.php.net/note/delete/125538/bad+code Del: spam -- https://master.php.net/note/delete/125538/spam Del: non-english -- https://master.php.net/note/delete/125538/non-english Del: in docs -- https://master.php.net/note/delete/125538/in+docs Del: other reasons-- https://master.php.net/note/delete/125538 Reject -- https://master.php.net/note/reject/125538 Search -- https://master.php.net/manage/user-notes.php