Php/docs/function.pi
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pi
(PHP 4, PHP 5, PHP 7)
pi — Get value of pi
Description
pi ( ) : 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.
Examples
Example #1 pi() example
<?phpecho pi(); // 3.1415926535898echo M_PI; // 3.1415926535898?>
