(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() 和 http_send_stream().
a Unix timestamp, converted to a valid HTTP date; if omitted, the current time will be sent
如果成功则返回 TRUE,失败则返回 FALSE。