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().
Example 1. pi() example
<?php
echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898
?>
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