Mathematical Constants
Approximation of the number π (pi). (3.14159265358979323846).
Predefined Constants Core
M_PI(float)Approximation of the number π (pi). (
3.14159265358979323846).M_E(float)Approximation of Euler's number
e(2.7182818284590452354).M_LOG2E(float)Approximation of
log2(e)(1.4426950408889634074).M_LOG10E(float)Approximation of
log10(e)(0.43429448190325182765).M_LN2(float)Approximation of
ln(2)(0.69314718055994530942).M_LN10(float)Approximation of
ln(10)(2.30258509299404568402).M_PI_2(float)Approximation of
π/2(1.57079632679489661923).M_PI_4(float)Approximation of
π/4(0.78539816339744830962).M_1_PI(float)Approximation of
1/π(0.31830988618379067154).M_2_PI(float)Approximation of
2/π(0.63661977236758134308).M_SQRTPI(float)Approximation of
sqrt(π)(1.77245385090551602729).M_2_SQRTPI(float)Approximation of
2/sqrt(π)(1.12837916709551257390).M_SQRT2(float)Approximation of
sqrt(2)(1.41421356237309504880).M_SQRT3(float)Approximation of
sqrt(3)(1.73205080756887729352).M_SQRT1_2(float)Approximation of
1/sqrt(2)(0.70710678118654752440).M_LNPI(float)Approximation of
ln(π)(1.14472988584940017414).M_EULER(float)Approximation of Euler's constant γ (
0.57721566490153286061).
NAN(float)Not A Number
INF(float)Infinity
PHP_ROUND_HALF_UP(int)Rounding half away from zero.
PHP_ROUND_HALF_DOWN(int)Rounding half toward zero.
PHP_ROUND_HALF_EVEN(int)Round halves to even numbers
PHP_ROUND_HALF_ODD(int)Round halves to odd numbers