php获取四位字母和数字的随机数的实现方法
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。
<?php functionGetfourStr($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; } echoGetfourStr(4); ?>
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)。