stats_dens_gamma
(PECL stats >= 1.0.0)
stats_dens_gamma — Probability density function of the gamma distribution
Description
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. 
Parameters
-  x
-  The value at which the probability density is calculated 
-  shape
-  The shape parameter of the distribution 
-  scale
-  The scale parameter of the distribution 
Return Values
 The probability density at x or false for failure. 
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    https://www.php.net/manual/en/function.stats-dens-gamma.php