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
/**
* 產生隨機整數，隨機字符串，隨機顏色等
*
* @param
* @arrange (512.筆記) 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();
/*** 來自編程之家 jb51.cc(jb51.cc) ***/
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