PHP has a set of math functions that allows you to perform mathematical tasks on numbers.

PHP pi() Function

The pi() function returns the value of PI:

echo(pi());

PHP min() and max() Functions

The min() and max() functions can be used to find the lowest or highest value in a list of arguments:

echo(min(0, 150, 30, 20, -8, -200));
echo(max(0, 150, 30, 20, -8, -200));

PHP abs() Function

The abs() function returns the absolute (positive) value of a number:

echo(abs(-6.7));

PHP sqrt() Function

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

echo(sqrt(64));

PHP round() Function

The round() function rounds a floating-point number to its nearest integer:

echo(round(0.60));
echo(round(0.49));

Random Numbers

The rand() function generates a random number:

echo(rand());

To get more control over the random number, you can add the optional min and max parameters to specify the lowest integer and the highest integer to be returned.

For example, if you want a random integer between 10 and 100 (inclusive), use rand(10, 100):

echo(rand(10, 100));

Complete PHP Math Reference

For a complete reference of all math functions, go to our complete PHP Math Reference.

The PHP math reference contains description and example of use, for each function.