LI. Mathematical Functions
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.
The following values are defined as constants in PHP by the math extension:
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] |
Only M_PI is available in PHP versions up to and including PHP 4.0.0. All other constants are
available starting with PHP 4.0.0. Constants labeled [4.0.2] were added in PHP 4.0.2.
- Table of Contents
- abs -- Absolute value
- acos -- Arc cosine
- acosh -- Inverse hyperbolic cosine
- asin -- Arc sine
- asinh -- Inverse hyperbolic sine
- atan -- Arc tangent
- atanh -- Inverse hyperbolic tangent
- atan2 -- arc tangent of two variables
- 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 -- e to the power of ...
- expm1 -- Returns exp(number) - 1, computed in a
way that accurate even when the value of number is close to zero
- floor -- Round fractions down
- getrandmax -- Show largest possible random
value
- hexdec -- Hexadecimal to decimal
- hypot -- Returns sqrt( num1*num1 + num2*num2)
- lcg_value -- Combined linear congruential
generator
- log -- Natural logarithm
- 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
- max -- Find highest value
- min -- Find lowest value
- mt_rand -- Generate a better random value
- mt_srand -- Seed the better random number
generator
- mt_getrandmax -- Show largest possible
random value
- number_format -- Format a number with
grouped thousands
- 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
|
