GETS the protocol number associated with the protocol name.
<?php
int|false getprotobyname ( str $protocol )
where,
$protocol = The protocol name
?>
EXERCISE
<table width="100%" cellspacing="3" cellpadding="3"
border="1" align="center"><tbody><tr><td colspan="2">PROTOCOLS</td></tr>
<tr><td >NAME</td><td>NUMBER</td></tr>
<?php
$arr01 = ['icmp', 'ggp', 'tcp', 'egp', 'pup', 'udp', 'hmp',
'xns-idp', 'rdp', 'ipv6', 'ipv6-route', 'ipv6-frag',
'esp', 'ah', 'ipv6-icmp', 'ipv6-nonxt',
'ipv6-opts', 'rvd' ];
foreach ($arr01 as $a01) { ?>
</tr><td><?php echo $a01; ?><td>
<?php echo getprotobyname($a01); ?></td></td></tr>
<?php } ?>
</tr><tr><td colspan="2">ed48</td></tr></tbody></table>