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# pi

(PHP 3, PHP 4 , PHP 5)

pi -- Get value of pi

## 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().

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

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