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run code in 200+ php & hhvm versions
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<?php $addresses = ['foo@8.8.8.8', 'foo@[8.8.8.8]']; foreach ($addresses as $addr) { var_dump(filter_var($addr, FILTER_VALIDATE_EMAIL)); }
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0beta1
bool(false) string(13) "foo@[8.8.8.8]"