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Get value of pi
(PHP 4, PHP 5)
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Pi is often usefull in con/sin/tan functions.. There are also other Pi related constants. These are most of them: M_PI = 3.14159265358979323846 // pi // The following were added in PHP 4.0.0 M_PI_2 = 1.57079632679489661923 // pi/2 M_PI_4 = 0.78539816339744830962 // pi/4 M_1_PI = 0.31830988618379067154 // 1/pi M_2_PI = 0.63661977236758134308 // 2/pi M_SQRTPI = 1.77245385090551602729 // sqrt(pi) (Only in PHP 4.0.2+) M_2_SQRTPI = 1.12837916709551257390 // 2/sqrt(pi) keamos
For anyone wondering, the highest precision you can get for pi() or M_PI is 20 places after the decimal point, or 3.14159265358979323846.
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