RuneScape World Ping

<?php
# Author: Yujin Boby
# Web: https://serverok.in

$rs_worlds_fav =  array(
    65,73,10,64,21,23,22,32,52,30
);

$rs_worlds_all = array(
    1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,
    18,19,20,21,22,23,24,25,26,27,28,29,30,31,
    32,33,34,35,36,37,38,39,40,41,42,43,44,45,
    46,47,48,49,50,51,52,53,54,55,56,57,58,59,
    60,61,62,63,64,65,66,67,68,69,70,71,72,73,
    74,75,76,77,78,79,80,81,82,83,84,85,86,87,
    88,89,91,92,94,95,96,97,98,99,100,101,102,
    103,104,105,106,107,108,109,110,111,112,
    113,114,115,116,117,118,119,120,121,122,
    123,124,125,126,127,128,129,130,131,132,
    133,134,135,136,137,138,139,140
);


if (isset($argv[1]) && $argv[1] == 'fav') {
    $rs_worlds_all = $rs_worlds_fav;
}

$server_ping_results = [];

foreach ($rs_worlds_all as $rs_world_number) {
    $server = 'world' . $rs_world_number . '.runescape.com';
    $ping = ping($server);
    if ($ping) {
        $server_ping_result['server'] = $server;
        $server_ping_result['ping'] = $ping;
        $server_ping_results[] = $server_ping_result;
    }
}

$pings = [];

foreach ($server_ping_results as $key => $row) {
    $pings[$key]  = $row['ping'];
}

array_multisort($pings, SORT_DESC,  $server_ping_results);

echo "\n\n";
echo "=======================================================\n";
echo "PING \t\tSERVER \n";
echo "=======================================================\n";

foreach ($server_ping_results as $key => $row) {
    echo $row['ping'] . "\t\t" . $row['server'] . "\n";
}

echo "\n\n";

function ping($server) {
    $cmd = '/bin/ping -c 5 ' . $server;
    $result = exec($cmd);
    $pattern = '/rtt min\/avg\/max\/mdev = \d{1,3}\.\d{1,3}\/(\d{1,3}).\d{1,3}\/\d{1,3}.\d{1,3}\/\d{1,3}\.\d{1,3} ms/';
    if (preg_match($pattern, $result, $matches)) {
        return $matches[1];
    } else {
        return false;
    }
}