请教一下，谢谢！

Question

<?php

function buildRandomString($type=1,$length=4){

 if（$type==1){

$chars=join("",range(0,9));

 }elseif($type==2){

$chars=join("",array_merge(range("a","z"),range("A","Z"))); 

 }elseif($type==3){

    $chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9)));

 }

 if（$length>strlen($chars)){

exit("字符串长度不够");

 }

 $chars=str_shuffle($chars);

 return substr($chars,0,$length);

}

提示第三行有错误

Answer 1

我郁闷，你第3行左边的括号有问题，我不知道你着吗打上去的

Answer 2

还有第五、七、十行也有错误