function rand_word($num=12){
$re='';
$list="abcdefghij来@源gao*daima.com搞@代#码网搞gaodaima代码klmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~0123456789#$%^&";
$list=str_split($list);
$key=array_rand($list,$num);
foreach($key as $value){
$re .= $list[$value];
}
return $re;
}