(PHP 4, PHP 5, PHP 7)
getprotobyname — Get protocol number associated with protocol name
getprotobyname ( string $name ) : int|false
getprotobyname() returns the protocol number associated with the protocol name as per /etc/protocols.
name
The protocol name.
Returns the protocol number, or false on failure.
Example #1 getprotobyname() example
<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot === FALSE) {
echo 'Invalid Protocol';
} else {
echo 'Protocol #' . $get_prot;
}
?>
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https://www.php.net/manual/en/function.getprotobyname.php