Generates beta random deviate
(PECL stats:1.0.0-1.0.2)
float stats_rand_gen_beta ( floata, floatb )
Returns a random deviate from the beta distribution with parameters A and
B. The density of the beta is x^(a-1) * (1-x)^(b-1) / B(a,b) for 0 < x
<. Method R. C. H. Cheng.
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