How can PHP be used to check the DNS entry of a domain in email validation?

To check the DNS entry of a domain in email validation using PHP, you can use the checkdnsrr() function. This function checks the DNS records for a given type (e.g., MX records for email validation). By checking the DNS entry of the domain in the email address, you can verify if the domain exists and is configured correctly. 

$email = "example@example.com";
list($user, $domain) = explode('@', $email);
if (checkdnsrr($domain, 'MX')) {
    echo "DNS entry for domain exists.";
} else {
    echo "DNS entry for domain does not exist.";
}

Keywords

PHP DNS entry domain email validation check

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