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run code in 200+ php & hhvm versions
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<?php $amount = '3'; $unit = '10'; $unit_price = '5'; var_dump(($amount / $unit) * $unit_price);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.2.6
float(1.5)