The PHP rand() function generates a random integer.

The PHP round() function rounds a floating-point number.

The PHP sin() function returns the sine of a number.

The PHP sinh() function returns the hyperbolic sine of a number, which is equal to (exp(number) – exp(-number))/2).

The PHP sqrt() function returns the square root of a number.

The PHP srand() function seeds the random number generator (rand()).

The PHP tan() function returns the tangent of a number.

The PHP tanh() function returns the hyperbolic tangent of a number, which is equal to sinh(x)/cosh(x).