(PECL stats >= 1.0.0)
stats_dens_pmf_poisson — Probability mass function of the Poisson distribution
stats_dens_pmf_poisson(float $x, float $lb): float
Returns the probability mass at x, where the random variable follows the Poisson distribution whose parameter is lb.
xThe value at which the probability mass is calculated
lbThe parameter of the Poisson distribution
The probability mass at x or false for failure.
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https://www.php.net/manual/en/function.stats-dens-pmf-poisson.php