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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.
Math constants
The following values are defined as constants in PHP by the math extension:
Tabulka 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] |
- Obsah
- 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)
- is_finite —
- is_infinite —
- is_nan —
- 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
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