(PHP 4, PHP 5, PHP 7, PHP 8)
getprotobyname — Get protocol number associated with protocol name
$protocol): int|false
getprotobyname() returns the protocol number
associated with the protocol protocol as per
/etc/protocols.
protocolThe protocol name.
Returns the protocol number, 或者在失败时返回 false.
示例 #1 getprotobyname() example
<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot === FALSE) {
echo 'Invalid Protocol';
} else {
echo 'Protocol #' . $get_prot;
}
?>