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@ 2014-07-01T08:39:10Z

<?php

$t = 'gb';

if ($t != 'GB' || $t != 'gb') { echo "1"; }
else { echo "0"; }

var_dump('GB' || 'gb');

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

57.03 ms | 402 KiB | 5 Q