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

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

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

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

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

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

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

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

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Finds whether a value is a legal finite number