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@ 2014-06-18T00:10:52Z

<?php

$email = 'johnsnow@ヒキワリ.ナットウ.com';
$email = idn_to_ascii($email);
$email = str_replace('xn--', '', $email);
echo $email . "\n";

$email = 'johnsnow@8x4hqntjic.gckxcpg.com';
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo 'valid';
} else {
    echo 'not valid';
}

Output
Performance
VLD
References
Branches

filter_var: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

34.92 ms | 402 KiB | 5 Q