PHP pi() Function – Returns Approximate Value of π
The PHP pi() function returns the approximate value of the mathematical constant π as a float, with precision set by the php.ini precision directive (default 14), and can also be accessed via the predefined M_PI constant, illustrated with a simple code example.
The pi() function in PHP returns the approximate value of the mathematical constant π as a float.
The precision of the returned value is controlled by the precision directive in php.ini, which defaults to 14 decimal places. The same result can be obtained using the predefined constant M_PI.
There are no parameters for pi(); the function simply returns the float approximation of π.
Example usage:
<?php
echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898
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