(PECL stats >= 1.0.0)
stats_rand_gen_exponential — Generates a random deviate from the exponential distribution
stats_rand_gen_exponential ( float $av ) : float
Returns a random deviate from the exponential distribution of which the scale is av.
av
The scale parameter
A random deviate
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https://www.php.net/manual/en/function.stats-rand-gen-exponential.php