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PHP Manual [pi]

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PHP Manual || Math Functions

(PHP 4, PHP 5, PHP 7)

piGet value of pi


pi ( void ) : float

Returns an approximation of pi. Also, you can use the M_PI constant which yields identical results to pi().

Return Values

The value of pi as float.


Example #1 pi() example

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

PHP Manual || Math Functions