php代码
/**
* @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;$i<$count;++$i){
$str_list .= $$case[$i];
}
return substr(str_shuffle($str_list),0,$length);
}
echo randomString("number,upper,lower",12);
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