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<getmxrrgetprotobynumber>
^Network FunctionsLast updated: Mon, 26 Oct 2026

getprotobyname

(PHP 4, PHP 5, PHP 7, PHP 8)

getprotobyname — Get protocol number associated with protocol name

Description

function getprotobyname(string $protocol): int|false

getprotobyname() returns the protocol number associated with the protocol protocol as per /etc/protocols.

Parameters

protocol

The protocol name.

Return Values

Returns the protocol number, or false on failure.

Examples

Example #1 getprotobyname() example

<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot === FALSE) {
    echo 'Invalid Protocol';
} else {
    echo 'Protocol #' . $get_prot;
}
?>

See Also


<getmxrrgetprotobynumber>
^Network FunctionsLast updated: Mon, 26 Oct 2026