ฟังก์ชันคณิตศาสตร์ PHP
บทนำคณิตศาสตร์ PHP
ฟังก์ชันทางคณิตศาสตร์สามารถจัดการค่าต่างๆ ภายในช่วงของประเภทจำนวนเต็มและจำนวนทศนิยม
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ฟังก์ชันคณิตศาสตร์ PHP เป็นส่วนหนึ่งของแกน PHP ไม่จำเป็นต้องติดตั้งเพื่อใช้ฟังก์ชันเหล่านี้
ฟังก์ชันคณิตศาสตร์ 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 |
PHP ค่าคงที่ทางคณิตศาสตร์ที่กำหนดไว้ล่วงหน้า
| 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 |