(PECL stats >= 1.0.0)
stats_skew — Computes the skewness of the data in the array
stats_skew(array $a): float
Returns the skewness of the values in a.
aThe input array
Returns the skewness of the values in a, or false if a is empty or is not an array.
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https://www.php.net/manual/en/function.stats-skew.php