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run code in 200+ php & hhvm versions
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<?php bcscale(6); $a = 1.1; $b = 2; var_dump(bcmul($a, $b));
based on q7IZg
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.11
string(3) "2.2"