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# pi

(PHP 3, PHP 4 )

pi -- Get value of pi

## Description

float pi ( void)

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().

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

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