Installing and configuring PHP Math Functions

Last update on August 19 2022 21:51:16 (UTC/GMT +8 hours)

In this page, we will discuss installing and configuring PHP math functions.

Requirements

PHP Math functions do not require any external library files.

Installation

Since PHP Math functions are part of the PHP core, they don't require any installation.

Runtime Configuration

You don't need to add any directive in php.ini for running PHP Math functions.

Resource Types

PHP Math functions have no defined resource types defined.

Predefined constants

In the following table, we have given a list of constants which are part of the PHP core.

**Math constants**
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