The PHP atan2() function returns the arc tangent of y/x, in radians, where x and y are the coordinates of a point (x,y).

The PHP atanh() function returns the inverse hyperbolic tangent of a number.

The PHP base_convert() function converts a number from one number base to another.

The PHP bindec() function converts a binary number to a decimal number.

The PHP ceil() function rounds a number up to the nearest integer if necessary.

The PHP cos() function returns the cosine (a numeric value between -1 and 1) of a number.

The PHP cosh() function returns the hyperbolic cosine of a number (equivalent to (exp(number) + exp(-number)) / 2).

The PHP decbin() function converts a decimal number to a binary number.

The PHP decoct() function converts a decimal number to an octal number.

The PHP deg2rad() function converts a degree value to a radian value.

The PHP exp() function returns E raised to the power of x.

The PHP expm1() function returns exp(x) – 1.

The PHP floor() function rounds a number DOWN to the nearest integer, if necessary, and returns the result.

The PHP fmod() function returns the remainder (modulo) of x/y.

The PHP getrandmax() function returns the largest possible value that can be returned by the rand() function.

The PHP hexdec() function converts a hexadecimal number to a decimal number.

The PHP hypot() function calculates the hypotenuse of a right-angle triangle.

The PHP intdiv() function is used for integer division.

The PHP is_finite() function checks whether a value is finite or not, and returns true (1) if the value is a finite number, or false/nothing if not.

The PHP is_infinite() function checks whether a value is infinite or not, and returns true (1) if the value is an infinite number, or false/nothing if not.