(PHP 4, PHP 5)
getprotobyname — Get protocol number associated with protocol name
getprotobyname() returns the protocol number associated with the protocol name as per /etc/protocols.
The protocol name.
Returns the protocol number or -1 if the protocol is not found.
Example#1 getprotobyname() example
<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot == -1) {
echo 'Invalid Protocol';
} else {
echo 'Protocol #' . $get_prot;
}
?>