(PECL stats >= 1.0.0)
stats_dens_chisquare — Probability density function of the chi-square distribution
stats_dens_chisquare ( float $x , float $dfr ) : float
Returns the probability density at x, where the random variable follows the chi-square distribution of which the degree of freedom is dfr.
x
The value at which the probability density is calculated
dfr
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-chisquare.php