(PHP 4, PHP 5, PHP 7, PHP 8)
getservbyport — Get Internet service which corresponds to port and protocol
getservbyport() returns the Internet service
associated with port
for the specified
protocol
as per /etc/services.
port
The port number.
protocol
protocol
is either "tcp"
or "udp"
(in lowercase).
Returns the Internet service name as a string, 或者在失败时返回 false
.