LI. Mathematical Functions
Introduction
These math functions will only handle values within the range of the integer and float types on your computer (this corresponds currently to the C types long resp. double). If you need to handle bigger numbers, take a look at the arbitrary precision math functions.
See also the manual page on arithmetic operators.
Predefined Constants
The constants below are always available as part of the PHP core.
Table 1. Math constants
| Constant | Value | Description |
|---|---|---|
| M_PI | 3.14159265358979323846 | Pi |
| M_E | 2.7182818284590452354 | e |
| M_LOG2E | 1.4426950408889634074 | log_2 e |
| M_LOG10E | 0.43429448190325182765 | log_10 e |
| M_LN2 | 0.69314718055994530942 | log_e 2 |
| M_LN10 | 2.30258509299404568402 | log_e 10 |
| 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) [4.0.2] |
| M_2_SQRTPI | 1.12837916709551257390 | 2/sqrt(pi) |
| M_SQRT2 | 1.41421356237309504880 | sqrt(2) |
| M_SQRT3 | 1.73205080756887729352 | sqrt(3) [4.0.2] |
| M_SQRT1_2 | 0.70710678118654752440 | 1/sqrt(2) |
| M_LNPI | 1.14472988584940017414 | log_e(pi) [4.0.2] |
| M_EULER | 0.57721566490153286061 | Euler constant [4.0.2] |
- Table of Contents
- abs -- Absolute value
- acos -- Arc cosine
- acosh -- Inverse hyperbolic cosine
- asin -- Arc sine
- asinh -- Inverse hyperbolic sine
- atan2 -- arc tangent of two variables
- atan -- Arc tangent
- atanh -- Inverse hyperbolic tangent
- base_convert -- Convert a number between arbitrary bases
- bindec -- Binary to decimal
- ceil -- Round fractions up
- cos -- Cosine
- cosh -- Hyperbolic cosine
- decbin -- Decimal to binary
- dechex -- Decimal to hexadecimal
- decoct -- Decimal to octal
- deg2rad -- Converts the number in degrees to the radian equivalent
- exp -- Calculates the exponent of e (the Neperian or Natural logarithm base)
- expm1 -- Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
- floor -- Round fractions down
- fmod -- Returns the floating point remainder (modulo) of the division of the arguments
- getrandmax -- Show largest possible random value
- hexdec -- Hexadecimal to decimal
- hypot -- Returns sqrt( num1*num1 + num2*num2)
- is_finite -- Finds whether a value is a legal finite number
- is_infinite -- Finds whether a value is infinite
- is_nan -- Finds whether a value is not a number
- lcg_value -- Combined linear congruential generator
- log10 -- Base-10 logarithm
- log1p -- Returns log(1 + number), computed in a way that accurate even when the val ue of number is close to zero
- log -- Natural logarithm
- max -- Find highest value
- min -- Find lowest value
- mt_getrandmax -- Show largest possible random value
- mt_rand -- Generate a better random value
- mt_srand -- Seed the better random number generator
- octdec -- Octal to decimal
- pi -- Get value of pi
- pow -- Exponential expression
- rad2deg -- Converts the radian number to the equivalent number in degrees
- rand -- Generate a random value
- round -- Rounds a float
- sin -- Sine
- sinh -- Hyperbolic sine
- sqrt -- Square root
- srand -- Seed the random number generator
- tan -- Tangent
- tanh -- Hyperbolic tangent