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<?php $c=0.000001089; $e=-ceil(log10($c)); $m=10^$e; $r=$c*$m; echo($e."\n"); echo($m.' DOGE = '.$r.' BTC'); ?>
Output for 5.2.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
5 15 DOGE = 1.6335E-5 BTC
Output for 4.3.0 - 5.2.1
5 15 DOGE = 1.6335E-05 BTC