(PECL stats >= 1.0.0)
stats_dens_pmf_binomial — Probability mass function of the binomial distribution
stats_dens_pmf_binomial ( float $x , float $n , float $pi ) : float
Returns the probability mass at x, where the random variable follows the binomial distribution of which the number of trials is n and the success rate is pi.
x
The value at which the probability mass is calculated
n
The number of trials of the distribution
pi
The success rate of the distribution
The probability mass at x or false for failure.
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https://www.php.net/manual/en/function.stats-dens-pmf-binomial.php