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.
Requirements
No external libraries are needed to build this extension.
Installation
There is no installation needed to use these functions; they are part of the PHP core.
Runtime Configuration
This extension has no configuration directives defined in php.ini.
Resource Types
This extension has no resource types defined.
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] |
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.
