(PECL stats:1.0.0-1.0.2)
stats_rand_gen_ibinomial_negative — Generates a single random deviate from a negative binomial distribution. Arguments : n - the number of trials in the negative binomial distribution from which a random deviate is to be generated (n > 0), p - the probability of an event (0 < p < 1)).
This function is currently not documented; only its argument list is available.