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run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = []; var_dump(filter_input(INPUT_POST, $test['arsch'], FILTER_SANITIZE_EMAIL));
based on Th2UT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Notice: Undefined index: arsch in /in/FEaNW on line 3 NULL