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run code in 200+ php & hhvm versions
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<?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 - 7.2.0