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run code in 200+ php & hhvm versions
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<?php $t = '1'; var_dump($t,(float)$t,(float)(float)(float)(float)(float)$t);
based on maLLV
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(1) "1" float(1) float(1)