(PHP 4, PHP 5, PHP 7, PHP 8)
getservbyport — Get Internet service which corresponds to port and protocol
getservbyport(int $port, string $protocol): string|false
getservbyport() returns the Internet service associated with port for the specified protocol as per /etc/services.
portThe port number.
protocol protocol is either "tcp" or "udp" (in lowercase).
Returns the Internet service name as a string, or false on failure.
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https://www.php.net/manual/en/function.getservbyport.php