PHP预定义数学常数

定义和用法

不变描述
M_PI3.14159265358979323846
2.7182818284590452354欧拉数e
M_LOG2E1.4426950408889634074日志2 e
M_LOG10E0.43429448190325182765日志10 e
M_LN20.69314718055994530942记录e 2
M_LN102.30258509299404568402记录e 10
M_PI_21.57079632679489661923pi / 2
M_PI_40.78539816339744830962pi / 4
M_1_PI0.318309886183790671541 /人
M_2_PI0.636619772367581343082 /点
M_SQRTPI1.77245385090551602729sqrt(pi)
M_2_SQRTPI1.128379167095512573902 /平方公尺
M_SQRT21.41421356237309504880sqrt(2)
M_SQRT31.73205080756887729352平方(3)
M_SQRT1_20.707106781186547524401 /平方(2)
M_LNPI1.14472988584940017414日志e(pi)
M_EULER0.57721566490153286061欧拉常数
PHP_ROUND_HALF_UP1减半
PHP_ROUND_HALF_DOWN2减半
PHP_ROUND_HALF_EVEN3将一半舍入为偶数
PHP_ROUND_HALF_ODD4将一半舍入到奇数
不是数字
INFINF无穷