(PECL stats >= 1.0.0)
stats_dens_beta — Probability density function of the beta distribution
stats_dens_beta(float $x, float $a, float $b): float
Returns the probability density at x, where the random variable follows the beta distribution of which the shape parameters are a and b.
xThe value at which the probability density is calculated
aThe shape parameter of the distribution
bThe shape 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-beta.php