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

(PHP 4, PHP 5, PHP 7) Rounds a float float round

(PHP 4, PHP 5, PHP 7) Exponential expression

(PHP 4, PHP 5, PHP 7) Base-10 logarithm float

(PHP 4, PHP 5, PHP 7) Find highest value mixed

(PHP 4, PHP 5, PHP 7) Square root float sqrt

(PHP 4, PHP 5, PHP 7) Arc tangent float atan

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Finds whether a value is not a number

(PHP 4, PHP 5, PHP 7) Binary to decimal number

(PHP 4, PHP 5, PHP 7) Decimal to octal string