[php-src] Issue #12304: Headers functions do nothing in CLI SAPI

Issue: https://github.com/php/php-src/issues/12304 Author: joanhey ### Description It seems an stupid issue, but please read. Related to #12303 The following code: `` ```php <?php header('Custom: xxx'); print_r(headers_list());` ```` Resulted in this output: ``` Array ( ) ``` But I expected this output instead: ``` Array ( [0] => Custon: xxx ) ``` We know that the CLI SAPI don't send headers, and for that it's OK that the sapi_cli_send_headerS() do nothing. https://github.com/php/php-src/blob/master/sapi/cli/php_cli.c#L395-L405 But all the other header(), header_remove(), headers_list() that depend from sapi_cli_header_handler() https://github.com/php/php-src/blob/master/sapi/cli/php_cli.c#L389-L392 can work normally from CLI. Only the headers_sent() need to be always false. Actual behavior: https://3v4l.org/XcuBg Yes, it's curious that the setcookie() return true. And the http_response_code() also work from CLI, we only need to set the initial value, but not the headers. First because other php functions use it internally, like setcookie, session, ... But it's more important to use php files without changes from CLI. Basic example: ```php <?php ob_start(); http_response_code(200); include 'file.php'; $body = ob_get_clean(); $headers = create_status( http_response_code()); $headers .= implode("\r\n", headers_list()) . "\r\n"; $headers .= 'Content-Length: ' . strlen($content); send_to_socket($headers, $body); ``` So we can use any PHP file from CLI and send it to any socket. **BC**: Nothing That functions now do nothing from CLI. If acepted it'll be good to ve added to all php suported versions. ### PHP Version All ### Operating System All