How to define pi in php

PHP pi() function

Definition and usage

pi() The function returns the value of pi.

Grammar (Recommended learning: PHP programming from entry to proficiency)

pi()

Instructions

Returns the approximate value of pi. The float precision of the return value is determined by the precision directive in php.ini. The default value is 14. You can also use the M_PI constant, which produces exactly the same result as pi().

Example

<?php
echo pi();
?>

Output similar to:

3.14159265359

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