Các hàm toán học PHP
Giới thiệu toán học PHP
Các hàm toán học có thể xử lý các giá trị trong phạm vi kiểu số nguyên và kiểu float.
Cài đặt
Các hàm toán học PHP là một phần của lõi PHP. Không cần cài đặt để sử dụng các chức năng này.
Các hàm toán học PHP
| 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() | Returns exp(x) - 1 |
| floor() | Rounds a number down to the nearest integer |
| fmod() | Returns the remainder of x/y |
| getrandmax() | Returns the largest possible value returned by rand() |
| hexdec() | Converts a hexadecimal number to a decimal number |
| hypot() | Calculates the hypotenuse of a right-angle triangle |
| intdiv() | Performs integer division |
| is_finite() | Checks whether a value is finite or not |
| is_infinite() | Checks whether a value is infinite or not |
| is_nan() | Checks whether a value is 'not-a-number' |
| lcg_value() | Returns a pseudo random number in a range between 0 and 1 |
| log() | Returns the natural logarithm of a number |
| log10() | Returns the base-10 logarithm of a number |
| log1p() | Returns log(1+number) |
| max() | Returns the highest value in an array, or the highest value of several specified values |
| min() | Returns the lowest value in an array, or the lowest value of several specified values |
| mt_getrandmax() | Returns the largest possible value returned by mt_rand() |
| mt_rand() | Generates 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 x raised to the power of y |
| rad2deg() | Converts a radian value to a degree value |
| rand() | Generates 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 a number |
| tanh() | Returns the hyperbolic tangent of a number |
Các hằng số toán học được xác định trước của PHP
| Constant | Value | Description |
|---|---|---|
| INF | INF | The infinite |
| M_E | 2.7182818284590452354 | Returns e |
| M_EULER | 0.57721566490153286061 | Returns Euler constant |
| M_LNPI | 1.14472988584940017414 | Returns the natural logarithm of PI: log_e(pi) |
| M_LN2 | 0.69314718055994530942 | Returns the natural logarithm of 2: log_e 2 |
| M_LN10 | 2.30258509299404568402 | Returns the natural logarithm of 10: log_e 10 |
| M_LOG2E | 1.4426950408889634074 | Returns the base-2 logarithm of E: log_2 e |
| M_LOG10E | 0.43429448190325182765 | Returns the base-10 logarithm of E: log_10 e |
| M_PI | 3.14159265358979323846 | Returns Pi |
| M_PI_2 | 1.57079632679489661923 | Returns Pi/2 |
| M_PI_4 | 0.78539816339744830962 | Returns Pi/4 |
| M_1_PI | 0.31830988618379067154 | Returns 1/Pi |
| M_2_PI | 0.63661977236758134308 | Returns 2/Pi |
| M_SQRTPI | 1.77245385090551602729 | Returns the square root of PI: sqrt(pi) |
| M_2_SQRTPI | 1.12837916709551257390 | Returns 2/square root of PI: 2/sqrt(pi) |
| M_SQRT1_2 | 0.70710678118654752440 | Returns the square root of 1/2: 1/sqrt(2) |
| M_SQRT2 | 1.41421356237309504880 | Returns the square root of 2: sqrt(2) |
| M_SQRT3 | 1.73205080756887729352 | Returns the square root of 3: sqrt(3) |
| NAN | NAN | Not A Number |
| PHP_ROUND_HALF_UP | 1 | Round halves up |
| PHP_ROUND_HALF_DOWN | 2 | Round halves down |
| PHP_ROUND_HALF_EVEN | 3 | Round halves to even numbers |
| PHP_ROUND_HALF_ODD | 4 | Round halves to odd numbers |
