php中文本设置随机颜色,php 产生随机整数，随机字符串，随机颜色等类用法

/**

* 产生随机整数，随机字符串，随机颜色等

*

* @param

* @arrange (512.笔记) jb51.cc

**/

public static class RandomHelper

{

private static Random randomSeed = new Random();

///

/// Generates a random string with the given length

///

/// Size of the string

/// If true,generate lowercase string

/// Random string

public static string RandomString(int size,bool lowerCase)

{

// StringBuilder is faster than using strings (+=)

StringBuilder RandStr = new StringBuilder(size);

// Ascii start position (65 = A / 97 = a)

int Start = (lowerCase) ? 97 : 65;

// Add random chars

for (int i = 0; i < size; i++)

RandStr.Append((char)(26 * randomSeed.NextDouble() + Start));

return RandStr.ToString();

}

///

/// Returns a random number.

///

/// Minimal result

/// Maximal result

/// Random number

public static int RandomNumber(int Minimal,int Maximal)

{

return randomSeed.Next(Minimal,Maximal);

}

///

/// Returns a random boolean value

///

/// Random boolean value

public static bool RandomBool()

{

return (randomSeed.NextDouble() > 0.5);

}

///

/// Returns a random color

///

///

public static System.Drawing.Color RandomColor()

{

return System.Drawing.Color.FromArgb(

randomSeed.Next(256),randomSeed.Next(256),randomSeed.Next(256)

);

}

}

//使用范例：

// Generate a random word:

string RandomWord = RandomHelper.RandomString(10,true);

// Generate a random number:

int Number = RandomHelper.RandomNumber(0,10);

// Generate a random boolean value:

bool Active = RandomHelper.RandomBool();

// Generate a random color:

Color Background = RandomHelper.RandomColor();

/*** 来自编程之家 jb51.cc(jb51.cc) ***/

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