php随机数代码：php生成随机数与随机字符串的例子
-
- /**
- * @param string $type
- * @param $length
- * @return string
- */
- function randomString($type="number,upper,lower",$length){
- $valid_type = array('number','upper','lower');
- $case = explode(",",$type);
- $count = count($case);
- //根据交集判断参数是否合法
- if($count !== count(array_intersect($case,$valid_type))){
- return false;
- }
- $lower = "abcdefghijklmnopqrstuvwxyz";
- $upper = strtoupper($lower);
- $number = "0123456789";
- $str_list = "";
- for($i=0;$i $str_list .= $$case[$i];
- }
- return substr(str_shuffle($str_list),0,$length);
- }
- echo randomString("number,upper,lower",12);
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