zend-blog-3-backend

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<?php
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namespace App\Utils;
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/**
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 * Only check MX records
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 */
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class VerifyEmail
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{
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    private static $domains = [];
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    public static function isValid(string $email): bool
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    {
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        $domain = self::getDomain($email);
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        if (isset(self::$domains[$domain])) {
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            return self::$domains[$domain];
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        }
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        $mxHosts = [];
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        getmxrr($domain, $mxHosts);
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        $isValid = !empty($mxHosts);
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        self::$domains[$domain] = $isValid;
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        return $isValid;
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    }
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    public static function normalize(string $email): string
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    {
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        return strtolower(trim($email));
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    }
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    private static function getDomain(string $email)
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    {
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        $email_arr = explode('@', $email);
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        $domain = array_slice($email_arr, -1);
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        return $domain[0];
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    }
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}
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