feat(app): add helper email check

website/composer.json

@@ -8,6 +8,11 @@
     "vlucas/phpdotenv": "^5.5",
     "php-amqplib/php-amqplib": "^2.0"
   },
+  "autoload": {
+    "psr-4": {
+      "App\\" : "src/"
+    }
+  },
   "license": "MIT",
   "authors": [
     {
@@ -16,7 +21,8 @@
   ],
   "minimum-stability": "stable",
   "require-dev": {
-    "squizlabs/php_codesniffer": "^3.7"
+    "squizlabs/php_codesniffer": "^3.7",
+    "symfony/var-dumper": "^6.3"
   },
   "scripts": {
     "phpcs": "phpcs --standard=PSR2"

website/index.php

@@ -2,4 +2,19 @@
 
 declare(strict_types=1);
 
+use App\Helpers\Email;
+
 require 'vendor/autoload.php';
+
+$emailRecords = [
+    '[email protected]',
+    '[email protected]',
+    'werewr.ertr',
+    '[email protected]'
+];
+
+try {
+    dump(Email::validateEmails($emailRecords));
+} catch (RuntimeException $e) {
+    dump($e);
+}

website/src/Helpers/Email.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Helpers;
+
+class Email
+{
+    protected static array $DNS = [];
+
+    public static function validateEmails(array $emails = []): array
+    {
+        $result = [];
+        foreach ($emails as $email) {
+            $result[] = filter_var($email, FILTER_VALIDATE_EMAIL) && static::checkDNS($email);
+        }
+
+        return array_combine($emails, $result);
+    }
+
+    public static function checkDNS(string $email): bool
+    {
+        $domain = substr(strrchr($email, '@'), 1);
+        if (isset(static::$DNS[$domain])) {
+            return static::$DNS[$domain];
+        }
+
+        try {
+            $resultEmail = getmxrr($domain, $mx_records) && count($mx_records) > 0;
+        } catch (\RuntimeException $e) {
+            $resultEmail = false;
+        }
+
+        static::$DNS[$domain] = $resultEmail;
+        return $resultEmail;
+    }
+}