Checks for a domain expiration 4 Zabbix

domain-check.php

#!/usr/bin/env php
<?php

ini_set('error_log', '/tmp/domain-check.log');

if (empty($argv[1])) {
    $msg = 'Expected domain name argument';
    trigger_error($msg);
    die($msg . PHP_EOL);
}

// Arguments
$domain = preg_replace('~^www\.~', '', $argv[1]);

// Available TLDs
$availTld = ['com', 'org', 'sk', 'cz'];

// Resolve domain TLD
foreach ($availTld as $tld) {
    if (preg_match('~\.' . preg_quote($tld) . '$~', $domain)) {
        break;
    }
    $tld = null;
}

// Functions
class Whois
{
    protected $whois;

    public function __construct($whois)
    {
        $this->whois = $whois;
    }

    public function parseDate($label, $pattern = ' (.*)')
    {
        $validDate = [];
        preg_match('~' . preg_quote($label) . $pattern . '~', $this->whois, $validDate);
        return $validDate[1];
    }
}

function remaining_days($date)
{
    return (new \DateTime($date))->diff(new \DateTime)->days;
}

// Get whois info
$whois = new \Whois(shell_exec('whois ' . escapeshellarg($domain)));

// Parse whois
switch ($tld) {
    case 'com':
        $days = remaining_days($whois->parseDate('Expiration Date:'));
        break;

    case 'org':
        $days = remaining_days($whois->parseDate('Registry Expiry Date:'));
        break;

    case 'sk':
        $days = remaining_days($whois->parseDate('Valid-date'));
        break;

    case 'cz':
        $days = remaining_days($whois->parseDate('expire:'));
        break;
}

if (!empty($days)) {
    error_log($domain . ' : ' . $days);
    die($days . PHP_EOL);
}

die('Not implemented' . PHP_EOL);