$message = "top - 11:41:04 up 21 min,  1 user,  load average: 0.00, 0.01, 0.07";
$pattern = "/\d\d:\d\d:\d\d/";
preg_match($pattern, $message, $matches);
var_dump($matches); //=> array(1) { [0]=>string(8) "11:41:04" }

$message = "top - 11:41:04 up 21 min,  1 user,  load average: 0.00, 0.01, 0.07";
$pattern = "/\d{2}:\d{2}:\d{2}/";
preg_match($pattern, $message, $matches);
var_dump($matches); //=> array(1) { [0]=>string(8) "11:41:04" }

$message = "top - 11:41:04 up 21 min,  1 user,  load average: 0.00, 0.01, 0.07";
$pattern = "/load average: (.+), (.+), (.+)/";
preg_match($pattern, $message, $matches);
var_dump($matches);
//=>
// array(4) {
//   [0]=>string(30) "load average: 0.00, 0.01, 0.07"
//   [1]=>string(4) "0.00"
//   [2]=>string(4) "0.01"
//   [3]=>string(4) "0.07"
// }

$message = "%Cpu(s):  1.2 us,  0.6 sy,  0.1 ni, 98.0 id,  0.1 wa,  0.0 hi,  0.1 si,  0.0 st";
$pattern = "/Cpu\(s\):  (.+) us|CPU usage: (.+)% user/";
preg_match($pattern, $message, $matches);
var_dump($matches);
//=>
// array(2) {
//  [0]=>string(15) "Cpu(s):  1.2 us"
//  [1]=>string(3) "1.2"
// }

<pre>
<?php
$top = shell_exec("top -n1 -b");
$regex = "/Tasks:  (\d+) total,\s+(\d+) running,\s+(\d+) sleeping,\s+(\d+) stopped,\s+(\d+) zombie/";
preg_match($regex, $top, $matches);
var_dump($matches);
?>

<?php
function crontrab_parse($crontab)
{
  $crontabArray = [];
  foreach (explode("\n", $crontab) as $cronLine) {
    $regex = '/(@yearly|@monthly|@daily|@reboot) (.+)|([^ ]+) ([^ ]+) ([^ ]+) ([^ ]+) ([^ ]+) (.+)/';
    preg_match($regex, $cronLine, $matches);
    if (in_array($matches[1], ["@yearly", "@monthly", "@daily", "@reboot"])) {
      $crontabArray[] = [
        "keyword" => $matches[1],
        "task" => $matches[2],
      ];
    } else {
      $crontabArray[] = [
        "minute" => $matches[1],
        "hour" => $matches[2],
        "day" => $matches[3],
        "month" => $matches[4],
        "weekDay" => $matches[5],
        "task" => $matches[6],
      ];
    }
  }
  return $crontabArray;
}

$crontab = file_get_contents('crontab.txt');
header("Content-type: application/json; charset=UTF-8");
header("Access-Control-Allow-Origin: *");
echo json_encode(crontrab_parse($crontab));

#!/bin/bash
ip=$1
cnt=$2
resping=`ping -c$cnt $ip`
temp=`echo -e "$resping \n" | grep icmp_seq | sed -E "s/(.+) bytes from (.+): icmp_seq=(.+) ttl=(.+) time=(.+) ms/\1 \2 \3 \4 \5/"`
n_linhas=`echo -e "$temp \n" | wc -l`
res="[\n"
for (( i=1; i < $n_linhas; i++ ))
do
	for (( j=1; j <= 5; j++ ))
	do
		rem=`echo -e "$temp \n" | sed "$i! d" | cut -f$j -d" "`
		case $j in
			1)
				bytes="\"bytes\":$rem,"
			;;
			2)
				ip="\"ip\":$rem,"
			;;
			3)
				icmp_seq="\"icmp_seq\":$rem,"
			;;
			4)
				ttl="\"ttl\":$rem,"
			;;
			5)
				timen="\"time\":$rem"
			;;
		esac
	done
	if (( $i == $n_linhas-1 ))
	then
		res="$res\t{\n\t\t$bytes\n\t\t$ip\n\t\t$icmp_seq\n\t\t$ttl\n\t\t$timen\n\t}\n"
	else
		res="$res\t{\n\t\t$bytes\n\t\t$ip\n\t\t$icmp_seq\n\t\t$ttl\n\t\t$timen\n\t},\n"
	fi
done
res="$res]"
echo -e $res

<?php
	function ping($host, $count) {
		$command = "./ping.sh ${host} ${count}";
		return shell_exec($command);
	}

	$host = $_GET['host'] ?? '';
	$count = $_GET['count'] ?? '1';

	header("Content-type: application/json; charset=UTF-8");
  header("Access-Control-Allow-Origin: *");
	echo ping($host, $count);

<?php
  function ping($host, $count) {
    $pingInfo = [];

    $result = ping_command($host, $count);

    if ($host && $result) {
      $pingInfo["host"] = $host;
      $pingInfo += ping_encode($result);
    } else {
      http_response_code(500);
      $pingInfo['error'] = 'Unknown host';
    }

    header("Content-type: application/json; charset=UTF-8");
    header("Access-Control-Allow-Origin: *");
    echo json_encode($pingInfo);
  }

  function is_unknown_host($result) {
    return strpos($result, 'Unknown host') !== false;
  }

  function ping_command($host, $count) {
    $command = "ping -c{$count} {$host}";
    $result = shell_exec($command);
    return is_unknown_host($result) ? NULL : $result;
  }

  function ping_encode($result) {
    $json = [];

    // ip
    $regex = "/\(([\d\.]+)\)/";
    preg_match($regex, $result, $matches);
    $json["ip"] = $matches[1];
    
    // packets
    $json["packets"] = [];
    $regex = "/icmp_seq=(\d+) ttl=(\d+) time=([\d\.]+)/";
    preg_match_all($regex, $result, $matches);
    foreach($matches[1] as $key => $sequence){
      $json["packets"][] = [
        "seq" => (int) $matches[1][$key],
        "ttl" => (int) $matches[2][$key],
        "time" => (float) $matches[3][$key]
      ];
    }
    
    // statistics
    $json["statistics"] = [];
    $regex = "/(\d+) packets transmitted, (\d+) (packets received|received)/";
    preg_match($regex, $result, $matches);
    $json["statistics"]["transmitted"] = (int) $matches[1];
    $json["statistics"]["received"] = (int) $matches[2];
    $json["statistics"]["losted"] = $matches[1] - $matches[2];

    $regex = "/min\/avg\/max\/(stddev|mdev) = ([\d\.]+)\/([\d\.]+)\/([\d\.]+)\/([\d\.]+)/";
    preg_match($regex, $result, $matches);
    $json["statistics"]["min"] = (float) $matches[1];
    $json["statistics"]["avg"] = (float) $matches[2];
    $json["statistics"]["max"] = (float) $matches[3];
    $json["statistics"]["stddev"] = (float) $matches[4];

    return $json;
  }

  $host = $_GET["host"] ?? null;
  $count = $_GET["count"] ?? 1;

  ping($host, $count);
?>