redis中list列表是否存在并发问题？或是其他问题导致的？如何处理遇到的这个情况，感谢解答！
$redis->connect('Redis',$options);
$redis_name = 'xxxx';
$u_id = rand(1000,2000);
$num = 10; //上限
if($redis->lLen($redis_name) <$num){
$redis->watch($redis_name); //监听,当监听值发生变化则失败
$redis->multi($redis_name); //事务开始
$redis->rPush($redis_name,$u_id.'%'.microtime());
$redis->exec($redis_name); //事务提交
echo $u_id.' 成功<br/>';
}else{
echo '活动结束<br/>';
}
$redis->close();超出上限的结果
array(11) {
[0]=>
string(26) "1143%0.03566400 1540276331"
[1]=>
string(26) "1145%0.06666600 1540276331"
[2]=>
string(26) "1903%0.07866600 1540276331"
[3]=>
string(26) "1612%0.08166600 1540276331"
[4]=>
string(26) "1786%0.11466800 1540276331"
[5]=>
string(26) "1811%0.14067000 1540276331"
[6]=>
string(26) "1150%0.14467000 1540276331"
[7]=>
string(26) "1173%0.14567000 1540276331"
[8]=>
string(26) "1040%0.18867300 1540276331"
[9]=>
string(26) "1894%0.20367300 1540276331"
[10]=>
string(26) "1340%0.20467300 1540276331"
}
