程式設計@筆記

例1
<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot === FALSE) {
echo 'Invalid Protocol';
} else {
echo 'Protocol #' . $get_prot;
}
?>

輸出：Protocol #6

例2
<?
$arr=array("ip","icmp","ggp","tcp",
"egp","pup","udp","hmp","xns-idp",
"rdp","rvd" );
//Reads the names of protocols into an array..
for($i=0;$i<11;$i++)
{
$proname=$arr[$i];
echo $proname .":", getprotobyname ($proname)."<br />";
}

?>

輸出：
ip:0
icmp:1
ggp:3
tcp:6
egp:8
pup:12
udp:17
hmp:20
xns-idp:22
rdp:27
rvd:66