(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns the floating point remainder (modulo) of the division of the arguments

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Inverse hyperbolic sine

(PHP 4, PHP 5, PHP 7) Seed the random number generator

(PHP 4, PHP 5, PHP 7) Natural logarithm float

(PHP 4, PHP 5, PHP 7) Round fractions down mixed

(PHP 4, PHP 5, PHP 7) Arc tangent of two variables

(PHP 4, PHP 5, PHP 7) Hexadecimal to decimal

(PHP 4, PHP 5, PHP 7) Convert a number between arbitrary bases

(PHP 4, PHP 5, PHP 7) Generate a random integer

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns log(1 + number), computed in a way that is accurate even when the