请教一下，谢谢！

Question

<?phpfunction 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