(PECL stats >= 1.0.0)
stats_dens_exponential — Probability density function of the exponential distribution
stats_dens_exponential(float $x, float $scale): float
Returns the probability density at x, where the random variable follows the exponential distribution of which the scale is scale.
xThe value at which the probability density is calculated
scaleThe scale 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-exponential.php