pi
(PHP 4, PHP 5, PHP 7, PHP 8)
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().
Parameters
This function has no parameters.
Return Values
The value of pi as float.
Examples
Example #1 pi() example
<?php echo pi(); // 3.1415926535898 echo M_PI; // 3.1415926535898 ?>
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https://www.php.net/manual/en/function.pi.php