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getservbyname

Description

The getservbyname of Network for PHP get port number associated with an Internet service and protocol.

Syntax

getservbyname(
    string $service,
    string $protocol
): int|false

Parameters

service

The Internet service name, as a string.

protocol

Either "tcp" or "udp" (in lowercase).

Return

Returns the port number, or false if service or protocol is not found.

Examples

1 · service · single · protocol

<?

$service = "http";
$protocol = "tcp";

$return = getservbyname($service, $protocol);

echo $return;

80

2 · service · multiple · protocol

<?

$array =
[
    "finger",
    "ftp",
    "gopher",
    "http",
    "imap",
    "nicname",
    "pop3",
    "smtp",
    "ssh",
    "telnet",
    "www"
];
$protocol = "tcp";

foreach($array as $service)
{
    $return = getservbyname($service, $protocol);

    echo "$service: $return", PHP_EOL;
}

finger: 79
ftp: 21
gopher: 70
http: 80
imap: 143
nicname: 43
pop3: 110
smtp: 25
ssh: 22
telnet: 23
www: 80