PHP 5 Math Functions
PHP Math Introduction
The math functions can handle values within the range of integer and float types.
Installation
The PHP math functions are part of the PHP core. No installation is required to use these functions.
PHP 5 Math Functions
| Function | Description |
|---|---|
| abs() | Returns the absolute (positive) value of a number |
| acos() | Returns the arc cosine of a number |
| acosh() | Returns the inverse hyperbolic cosine of a number |
| asin() | Returns the arc sine of a number |
| asinh() | Returns the inverse hyperbolic sine of a number |
| atan() | Returns the arc tangent of a number in radians |
| atan2() | Returns the arc tangent of two variables x and y |
| atanh() | Returns the inverse hyperbolic tangent of a number |
| base_convert() | Converts a number from one number base to another |
| bindec() | Converts a binary number to a decimal number |
| ceil() | Rounds a number UP to the nearest integer |
| cos() | Returns the cosine of a number |
| cosh() | Returns the hyperbolic cosine of a number |
| decbin() | Converts a decimal number to a binary number |
| dechex() | Converts a decimal number to a hexadecimal number |
| decoct() | Converts a decimal number to an octal number |
| deg2rad() | Converts a degree value to a radian value |
| exp() | Calculates the exponent of e |
| expm1() | Calculates the equivalent of exp(x)-1 |
| floor() | Rounds a number DOWN to the nearest integer |
| fmod() | Returns the remainder (modulo) of the division of the arguments |
| Returns the maximum random number that can be returned by a call to the rand() function | |
| hexdec() | Converts a hexadecimal number to a decimal number |
| hypot() | Returns the length of the hypotenuse of a right-angle triangle |
| is_finite() | Returns true if a value is a finite number |
| is_infinite() | Returns true if a value is an infinite number |
| is_nan() | Returns true if a value is not a number |
| lcg_value() | Returns a pseudo random number in the range of (0,1) |
| log() | Returns the natural logarithm (base E) of a number |
| log10() | Returns the base-10 logarithm of a number |
| log1p() | Returns log(1+number) |
| max() | Returns the number with the highest value of two specified numbers |
| min() | Returns the number with the lowest value of two specified numbers |
| mt_getrandmax() | Returns the largest possible value that can be returned by mt_rand() |
| mt_rand() | Returns a random integer using Mersenne Twister algorithm |
| mt_srand() | Seeds the Mersenne Twister random number generator |
| octdec() | Converts an octal number to a decimal number |
| pi() | Returns the value of PI |
| pow() | Returns the value of x to the power of y |
| rad2deg() | Converts a radian value to a degree value |
| rand() | Returns a random integer |
| round() | Rounds a floating-point number |
| sin() | Returns the sine of a number |
| sinh() | Returns the hyperbolic sine of a number |
| sqrt() | Returns the square root of a number |
| srand() | Seeds the random number generator |
| tan() | Returns the tangent of an angle |
| tanh() | Returns the hyperbolic tangent of an angle |
PHP 5 Predefined Math Constants
| Constant | Value | Description | PHP Version |
|---|---|---|---|
| INF | INF | The infinite | PHP 4 |
| M_E | 2.7182818284590452354 | Returns e | PHP 4 |
| M_EULER | 0.57721566490153286061 | Returns Euler constant | PHP 4 |
| M_LNPI | 1.14472988584940017414 | Returns the natural logarithm of PI: log_e(pi) | PHP 5.2 |
| M_LN2 | 0.69314718055994530942 | Returns the natural logarithm of 2: log_e 2 | PHP 4 |
| M_LN10 | 2.30258509299404568402 | Returns the natural logarithm of 10: log_e 10 | PHP 4 |
| M_LOG2E | 1.4426950408889634074 | Returns the base-2 logarithm of E: log_2 e | PHP 4 |
| M_LOG10E | 0.43429448190325182765 | Returns the base-10 logarithm of E: log_10 e | PHP 4 |
| M_PI | 3.14159265358979323846 | Returns Pi | PHP 4 |
| M_PI_2 | 1.57079632679489661923 | Returns Pi/2 | PHP 4 |
| M_PI_4 | 0.78539816339744830962 | Returns Pi/4 | PHP 4 |
| M_1_PI | 0.31830988618379067154 | Returns 1/Pi | PHP 4 |
| M_2_PI | 0.63661977236758134308 | Returns 2/Pi | PHP 4 |
| M_SQRTPI | 1.77245385090551602729 | Returns the square root of PI: sqrt(pi) | PHP 5.2 |
| M_2_SQRTPI | 1.12837916709551257390 | Returns 2/square root of PI: 2/sqrt(pi) | PHP 4 |
| M_SQRT1_2 | 0.70710678118654752440 | Returns the square root of 1/2: 1/sqrt(2) | PHP 4 |
| M_SQRT2 | 1.41421356237309504880 | Returns the square root of 2: sqrt(2) | PHP 4 |
| M_SQRT3 | 1.73205080756887729352 | Returns the square root of 3: sqrt(3) | PHP 5.2 |
| NAN | NAN | Not A Number | PHP 4 |
| PHP_ROUND_HALF_UP | 1 | Round halves up | PHP 5.3 |
| PHP_ROUND_HALF_DOWN | 2 | Round halves down | PHP 5.3 |
| PHP_ROUND_HALF_EVEN | 3 | Round halves to even numbers | PHP 5.3 |
| PHP_ROUND_HALF_ODD | 4 | Round halves to odd numbers | PHP 5.3 |
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