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run code in 150+ php & hhvm versions
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<?php $fAmount = '52.64'; $fAmount = (float)$fAmount * (-1); var_dump($fAmount);
based on Km3MR
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(-52.64)