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### 16.23. Math Functions

There are two types of math functions in PHP. The first type is the standard functions that operate on regular numbers. The scope and precision of these functions are limited by the operating system.

int abs(int number)

Return the absolute value of the number

double acos(double number)

Return the arc cosine of the number in radians

double asin(double number)

Return the arc sine of the number in radians

double atan(double number)

Return the arc tangent of the number in radians

double atan2(double y, double x)

Return the arc tangent of y/x, with the resulting quadrant determined by the signs of y and x

string base_convert(string number, int frombase, int tobase)

Convert a number in a string from any base to any other base (where both bases are less than or equal to 36)

int bindec(string binary_number)

Return the decimal equivalent of the binary number

int ceil(double number)

Return the next higher integer value of the number

double cos(double number)

Return the cosine of the number in radians

string decbin(int decimal_number)

Return a string containing a binary representation of the number

string dechex(int decimal_number)

Return a string containing a hexadecimal representation of the given number

string decoct(int octal_number)

Return a string containing an octal representation of the given number

Convert the number in degrees to the radian equivalent

double exp(double number)

Return e raised to the power of the number

int floor(double number)

Return the next lower integer value from the number

Return the decimal equivalent of the hexadecimal number

double log(double number)

Return the natural logarithm of the number

double log10(double number)

Return the base-10 logarithm of the number

string number_format(double number [,int num_decimal_places [,string dec_separator, string thousands_separator)]])

Formats a number with grouped thousands

int octdec(string octal_number)

Return the decimal equivalent of an octal string

double pi(void)

Return an approximation of pi

double pow(double base, double exponent)

Return base raised to the power of exponent

Convert the radian number to the equivalent number in degrees

double round(double number)

Return the rounded value of the number

double sin(double number)

Return the sine of the number in radians

double sqrt(double number)

Return the square root of the number

double tan(double number)

Return the tangent of the number in radians

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