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run code in 150+ php & hhvm versions
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<?php $data='iujhklsc'; if ( base64_encode(base64_decode($data)) === $data){ echo '$data is valid'; } else { echo '$data is NOT valid'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
$data is valid