php获取随机字符串，可设置位数以及大小写

/**@name 获取随机字符串，大小写字母+数字，转变不区分大小写
 *@param $len 长度
 *@param $ignoreCase 忽略大小写
 * */
function get_salt($len=6, $ignoreCase=true)
{
    //return substr(uniqid(rand()), -$len);
    $discode="123546789wertyupkjhgfdaszxcvbnm".($ignoreCase?'': 'QABCDEFGHJKLMNPRSTUVWXYZ');
    $code_len = strlen($discode);
    $code = "";
    for($j=0; $j<$len; $j++){
        $code .= $discode[rand(0, $code_len-1)];
    }
    return $code;
}
echo get_salt(13, true);