怎么利用PHP去ping一个地址_PHP

if(($server == '127.0.0.1') | | ($server == 'localhost') | | ($server == getenv("SERVER_ADDR"))) {

echo "

echo "Fuck Off!
";

echo "

} else {
if($server =="") {

echo "

请输入url或ip地址:

$ip = getenv("REMOTE_ADDR");
$hname = getenv("HTTP_HOST");

echo "Your IP is: $ip
"
."Trying to ping: $server
"
."Using server: $hname";

echo "

echo "STATS:

";

$command = "ping -c4 $server";

exec($command, $result, $rval);

if(count($result) <= 0) {

echo "没有响应
";

echo "

exit;
}

for ($i = 0; $i < count($result); $i++) {

echo "$result[$i]
";

}
echo "