(PECL stats >= 1.0.0)
stats_stat_powersum — Returns the power sum of a vector
stats_stat_powersum ( array $arr , float $power ) : float
Returns the sum of the power-th power of a vector represented as an array arr.
arr
The input array
power
The power
Returns the power sum of the input array.
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https://www.php.net/manual/en/function.stats-stat-powersum.php