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run code in 150+ php & hhvm versions
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<?php $a = false; var_dump(strtolower($a)); var_dump((boolean)' 0'); var_dump((int)' 1 2 3padeasat3');
based on 0LjRD
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(0) "" bool(true) int(1)