Math
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<?php
function standard_deviation($array) {
//Get sum of array values
while(list($key,$val) = each($array)) {
$total += $val;
}
reset($array);
$mean = $total/count($array);
while(list($key,$val) = each($array)) {
$sum += pow(($val-$mean),2);
}
$var = sqrt($sum/(count($array)-1));
return $var;
}
?>
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Usage Example
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<?php
$array = array(5,6,7,10);
$var = standard_deviation($array);
echo $var; //Returns ~2.2 in this example
?>
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