The constants below are always available as part of the PHP core.
| Constant | Value | Description | Availability |
|---|---|---|---|
| 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) | PHP 5.2.0 |
| M_2_SQRTPI | 1.12837916709551257390 | 2/sqrt(pi) | |
| M_SQRT2 | 1.41421356237309504880 | sqrt(2) | |
| M_SQRT3 | 1.73205080756887729352 | sqrt(3) | PHP 5.2.0 |
| M_SQRT1_2 | 0.70710678118654752440 | 1/sqrt(2) | |
| M_LNPI | 1.14472988584940017414 | log_e(pi) | PHP 5.2.0 |
| M_EULER | 0.57721566490153286061 | Euler constant | PHP 5.2.0 |
| PHP_ROUND_HALF_UP | 1 | Round halves up | PHP 5.3.0 |
| PHP_ROUND_HALF_DOWN | 2 | Round halves down | PHP 5.3.0 |
| PHP_ROUND_HALF_EVEN | 3 | Round halves to even numbers | PHP 5.3.0 |
| PHP_ROUND_HALF_ODD | 4 | Round halves to odd numbers | PHP 5.3.0 |
| NAN | NAN (as a float) | Not A Number | |
| INF | INF (as a float) | The infinite |
All constants without a labeled PHP version above are available starting with PHP 4.0.0.