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php获取四位字母和数字的随机数的实现方法_PHP

WBOY
WBOYOriginal
2016-05-31 13:18:07749browse

那么我们知道在php中简单的四位数的纯数字验证可以用rand(1000,9999)就可以了,但如果我们要得到字母和数字的随机四位数,那我们该如何写函数呢?下面胡鹏博客在php资料栏目下给出一个完整的实例。

<&#63;php
function GetfourStr($len) 
{ 
  $chars_array = array( 
    "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
    "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
    "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
    "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
    "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", 
    "S", "T", "U", "V", "W", "X", "Y", "Z", 
  ); 
  $charsLen = count($chars_array) - 1; 
 
  $outputstr = ""; 
  for ($i=0; $i<$len; $i++) 
  { 
    $outputstr .= $chars_array[mt_rand(0, $charsLen)]; 
  } 
  return $outputstr; 
} 
echo GetfourStr(4);
&#63;>

其中部分函数解析:mt_rand函数说明:mt_rand()返回随机整数。
如果没有提供可选参数 min 和 max,mt_rand() 返回 0 到 RAND_MAX 之间的伪随机数。例如想要 0 到 46(包括 0 和 46)之间的随机数,用 mt_rand(0, 46)。

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