PHP 8.4.0 Alpha 2 available for testing


(PECL stats >= 1.0.0)

stats_dens_pmf_poissonProbability 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.

Bağımsız Değişkenler


The value at which the probability mass is calculated


The parameter of the Poisson distribution

Dönen Değerler

The probability mass at x or false for failure.

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