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run code in 150+ php & hhvm versions
Bugs & Features
<?php $A = array(9,4,10); function standard_deviation($A){ if(is_array($sample)){ $mean = array_sum($sample) / count($sample); foreach($sample as $key => $num) $devs[$key] = pow($num - $mean, 2); return sqrt(array_sum($devs) / (count($devs) - 1)); } } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0