//随机产生$num位字符串
function mkrandomstr($num=6){
$str="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$str=str_shuffle($str);
return substr($str, 0,$num);
}
//随机产生$num位字符串
function mkrandomstr($num=6)
{
$str="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$randStr = "";
for($i=0;$i<$num; $i++)
{
$rand = rand(0,62);
$randStr .= $str[$rand];
}
return $randStr;
}