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PHP Math


出处:互联网   整理: 软晨网(RuanChen.com)   发布: 2009-03-01   浏览: 808 ::
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PHP Math Introduction
PHP数学介绍

The math functions can handle values within the range of integer and float types.
这些数学函数仅能处理在你计算机上 integer 和 float 范围内的值


Installation
安装

The math functions are part of the PHP core. There is no installation needed to use these functions.
本函数库作为 PHP 内核的一部分,不用安装就能使用。


PHP Math Functions
PHP数学函数

PHP: indicates the earliest version of PHP that supports the function.
PHP:最早支持这些函数的PHP版本

Function Description PHP
abs() Returns the absolute value of a number
绝对值
3
acos() Returns the arccosine of a number
反余弦
3
acosh() Returns the inverse hyperbolic cosine of a number
反双曲余弦
4
asin() Returns the arcsine of a number
反正弦
3
asinh() Returns the inverse hyperbolic sine of a number
反双曲正弦
4
atan() Returns the arctangent of a number as a numeric value between -PI/2 and PI/2 radians
反正切
3
atan2() Returns the angle theta of an (x,y) point as a numeric value between -PI and PI radians
两个参数的反正切
3
atanh() Returns the inverse hyperbolic tangent of a number
反双曲正切
4
base_convert() Converts a number from one base to another
在任意进制之间转换数字
3
bindec() Converts a binary number to a decimal number
二进制转换为十进制
3
ceil() Returns the value of a number rounded upwards to the nearest integer
进一法取整
3
cos() Returns the cosine of a number
余弦
3
cosh() Returns the hyperbolic cosine of a number
双曲余弦
4
decbin() Converts a decimal number to a binary number
十进制转换为二进制
3
dechex() Converts a decimal number to a hexadecimal number
十进制转换为十六进制
3
decoct() Converts a decimal number to an octal number
十进制转换为八进制
3
deg2rad() Converts a degree to a radian number
将角度转换为弧度
3
exp() Returns the value of Ex
计算 e(自然对数的底)的指数
3
expm1() Returns the value of Ex - 1
返回 exp(number) - 1,甚至当 number 的值接近零也能计算出准确结果
4
floor() Returns the value of a number rounded downwards to the nearest integer
舍去法取整
3
fmod() Returns the remainder (modulo) of the division of the arguments
返回除法的浮点数余数
4

getrandmax()

Returns the maximum random number that can be returned by a call to the rand() function
显示随机数最大的可能值
3
hexdec() Converts a hexadecimal number to a decimal number
十六进制转换为十进制
3
hypot() Returns the length of the hypotenuse of a right-angle triangle
计算一直角三角形的斜边长度
4
is_finite() Returns true if a value is a finite number
判断是否为有限值
4
is_infinite() Returns true if a value is an infinite number
判断是否为无限值
4
is_nan() Returns true if a value is not a number
判断是否为合法数值
4
lcg_value() Returns a pseudo random number in the range of (0,1)
组合线性同余发生器
4
log() Returns the natural logarithm (base E) of a number
自然对数
3
log10() Returns the base-10 logarithm of a number
以 10 为底的对数
3
log1p() Returns log(1+number)
返回 log(1 + number),甚至当 number 的值接近零也能计算出准确结果
4
max() Returns the number with the highest value of two specified numbers
找出最大值
3
min() Returns the number with the lowest value of two specified numbers
找出最小值
3
mt_getrandmax() Returns the largest possible value that can be returned by mt_rand()
显示随机数的最大可能值
3
mt_rand() Returns a random integer using Mersenne Twister algorithm
产生一个随机整数 using Mersenne Twister algorithm 生成更好的随机数
3
mt_srand() Seeds the Mersenne Twister random number generator
播下一个更好的随机数发生器种子
3
octdec() Converts an octal number to a decimal number
八进制转换为十进制
3
pi() Returns the value of PI
得到圆周率值
3
pow() Returns the value of x to the power of y
返回指数表达式的值,即:x的y次方
3
rad2deg() Converts a radian number to a degree
将弧度数转换为相应的角度数
3
rand() Returns a random integer
产生一个随机整数
3
round() Rounds a number to the nearest integer
对浮点数进行四舍五入取整
3
sin() Returns the sine of a number
正弦
3
sinh() Returns the hyperbolic sine of a number
双曲正弦
4
sqrt() Returns the square root of a number
平方根
3
srand() Seeds the random number generator
播下随机数发生器种子
3
tan() Returns the tangent of an angle
正切
3
tanh() Returns the hyperbolic tangent of an angle
双曲正切
4


PHP Math Constants
PHP数学常量

PHP: indicates the earliest version of PHP that supports the constant.
PHP:最早支持这些常量的PHP版本

Constant
常量
Description
说明
PHP
M_E Returns e (approx. 2.718)
返回自然对数底(值大约为:2.718)
4
M_EULER Returns Euler's constant (approx. 0.577)
欧拉常数(值大约为:0.57721566490153286061)
4
M_LNPI

Returns the natural logarithm of PI (approx. 1.144)
返回PI的自然对数(值大约为:1.144)

4
M_LN2 Returns the natural logarithm of 2 (approx. 0.693)
返回2的自然对数(值大约为:0.693)
4
M_LN10 Returns the natural logarithm of 10 (approx. 2.302)
返回10的自然对数(值大约为:2.302)
4
M_LOG2E Returns the base-2 logarithm of E (approx. 1.442)
返回E对应的以2为底的自然对数(值大约为:1.442)
4
M_LOG10E Returns the base-10 logarithm of E (approx. 0.434)
返回E对应的以10为底的自然对数(值大约为:0.434)
4
M_PI Returns PI (approx. 3.14159)
返回PI(值大约为:3.14159)
3
M_PI_2 Returns PI/2 (approx. 1.570)
返回PI/2(值大约为:1.570)
4
M_PI_4 Returns PI/4 (approx. 0.785)
返回PI/4(值大约为:0.785)
4
M_1_PI Returns 1/PI (approx. 0.318)
返回1/PI(值大约为:0.318)
4
M_2_PI Returns 2/PI (approx. 0.636)
返回2/PI(值大约为:0.636)
4
M_SQRTPI Returns the square root of PI (approx. 1.772)
返回PI的平方根(值大约为:1.772)
4
M_2_SQRTPI Returns 2/square root of PI (approx. 1.128)
返回PI的平方根的两倍倒数(值大约为:1.128)
4
M_SQRT1_2 Returns the square root of 1/2 (approx. 0.707)
返回1/2的平方根(值大约为:0.707)
4
M_SQRT2 Returns the square root of 2 (approx. 1.414)
返回2的平方根(值大约为:1.414)
4
M_SQRT3 Returns the square root of 3 (approx. 1.732)
返回3的平方根(值大约为:1.732)
4

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