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Get value of pi (PHP 4, PHP 5)
float pi ( )

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().

Return Values

The value of pi as float.


Example 1155. pi() example

echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898