pi() - math

Returns an approximation of pi. The returned float has a precision based on the precision directive in php.ini, which defaults to 14. Also, you can use the M_PI constant which yields identical results to pi().

Syntax

float pi
     ( void
    )

Example

<?phpecho pi(); // 3.1415926535898echo M_PI; // 3.1415926535898?>

Output / Return Value

Limitations

Alternatives / See Also

Reference