(PECL stats >= 1.0.0)
stats_dens_gamma — Probability density function of the gamma distribution
stats_dens_gamma ( float $x , float $shape , float $scale ) : float
Returns the probability density at x, where the random variable follows the gamma distribution of which the shape parameter is shape and the scale parameter is scale.
x
The value at which the probability density is calculated
shape
The shape parameter of the distribution
scale
The scale parameter of the distribution
The probability density at x or false for failure.
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https://www.php.net/manual/en/function.stats-dens-gamma.php