Mathématiques
Introduction Abs Acos acosh Asin asinh Atan Atan2 atanh base_convert BinDec Ceil Cos cosh DecBin DecHex DecOct deg2rad Exp Floor getrandmax hexdec lcg_value Log Log10 max min mt_rand mt_srand mt_getrandmax number_format OctDec pi pow rad2deg rand round Sin sinh Sqrt srand Tan tanh
Description
float pi(void)
pi retourne la valeur de pi.
<?php echo pi();// 3.1415926535898?>