(PECL stats >= 1.0.0) Generates a single random deviate from an exponential distribution with mean "av"

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Subtract numbers

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Hamming distance

(PHP 4, PHP 5, PHP 7) Show largest possible random value

(PECL stats >= 1.0.0) Generates a single random deviate from a noncentral T distribution

(PECL stats >= 1.0.0) Returns a random floating point number from a uniform distribution over 0 - 1 (endpoints

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Bitwise XOR

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Population count

(PECL stats >= 1.0.0) Calculates any one parameter of the gamma distribution given values for the others

(PECL stats >= 1.0.0) CDF function for BETA Distribution. Calculates any one parameter of the beta distribution