(PECL pecl_http:0.1.0-1.5.5)
http_send_last_modified — Send Last-Modified
Send a Last-Modified header with a valid HTTP date.
Note: This function is supposed to be used in conjunction with http_send_data(), http_send_file() , y http_send_stream().
a Unix timestamp, converted to a valid HTTP date; if omitted, the current time will be sent
Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.