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(), PHP_EOL; / 3.1415926535898
    echo M_PI, PHP_EOL; / 3.1415926535898
    ?>

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