PHP Predefined Mathematical Constants

PHPServer Side ProgrammingProgramming

Definition and Usage

ConstantValueDescription
M_PI3.14159265358979323846Pi
M_E2.7182818284590452354Euler Number e
M_LOG2E1.4426950408889634074log2 e
M_LOG10E0.43429448190325182765log10 e
M_LN20.69314718055994530942loge 2
M_LN102.30258509299404568402loge10
M_PI_21.57079632679489661923pi/2
M_PI_40.78539816339744830962pi/4
M_1_PI0.318309886183790671541/pi
M_2_PI0.636619772367581343082/pi
M_SQRTPI1.77245385090551602729sqrt(pi)
M_2_SQRTPI1.128379167095512573902/sqrt(pi)
M_SQRT21.41421356237309504880sqrt(2)
M_SQRT31.73205080756887729352sqrt(3)
M_SQRT1_20.707106781186547524401/sqrt(2)
M_LNPI1.14472988584940017414loge(pi)
M_EULER0.57721566490153286061Euler constant
PHP_ROUND_HALF_UP1Round halves up
PHP_ROUND_HALF_DOWN2Round halves down
PHP_ROUND_HALF_EVEN3Round halves to even numbers
PHP_ROUND_HALF_ODD4Round halves to odd numbers
NANNANNot A Number
INFINFInfinity
raja
Published on 30-Jun-2020 11:06:18
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