(PECL stats >= 1.0.0)
stats_dens_f — Probability density function of the F distribution
stats_dens_f ( float $x , float $dfr1 , float $dfr2 ) : float
Returns the probability density at x, where the random variable follows the F distribution of which the degree of freedoms are dfr1 and dfr2.
x
The value at which the probability density is calculated
dfr1
The degree of freedom of the distribution
dfr2
The degree of freedom 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-f.php