我正在尝试将下面的javascript代码转换为php
function randomString(len) {
var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmn opqrstuvwxyz";
var string_length = len;
var randomstring = '';
for (var i = 0; i < string_length; i++) {
var rnum = Math.floor(Math.random() * chars.length);
randomstring += chars.substring(rnum, rnum + 1);
}
return randomstring;
}
我的PHP代码到目前为止.. 编辑:下面的工作代码
function randomString($len) {
$chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
$string_length = strlen($chars);
$randomstring = '';
for ($i = 0; $i< $len; $i++) {
$rnum = rand(0,$string_length);
$randomstring.= $chars[$rnum];
}
return $randomstring;
}
echo randomString(16);
chars.substring(rnum,rnum + 1)是什么意思......我怎样才能在php中实现...我能理解它需要$ chars的特定字符...但是rnum + 1是什么为了?