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run code in 200+ php & hhvm versions
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<?php bcscale(3); $a = 2.589; $b = 1.089; var_dump(bcsub($a, $b));
based on NjEa2
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
string(5) "1.500"