lpushx 将一个或多个值插入到已存在的列表头部

如果列表存在，则将字符串值添加到列表的头(左边)。
Parameters:
string $key
Returns:
如果命令执行成功，失败时BOOL FALSE(空列表)
Declared in: Redis
Links: https://redis.io/commands/lpop
Source:
S:/Software/JetBrains/PHPStorm/App/PhpStorm-2020.2.1.win/plugins/php/lib/php.jar!/stubs/redis/Redis.php
lPop on redis.io

<?php
//连接本地的 Redis 服务
$redis = new Redis();
$redis->connect('10.1.3.15', 6379);
$redis->auth('kuaicdn_redis_passwd');
$redis->flushAll();
$ret['exec']['a'][]=$redis->lPush('list_test_a','value_a_1');
$ret['exec']['a'][]=$redis->lPushx('list_test_a','value_a_2');
$ret['exec']['a'][]=$redis->lPushx('list_test_a','value_a_3');
$ret['exec']['b'][]=$redis->lPushx('list_test_b','value_b_1');
$ret['exec']['b'][]=$redis->lPushx('list_test_b','value_b_2');
$ret['exec']['b'][]=$redis->lPushx('list_test_b','value_b_3');
$ret['src']['a']=$redis->lRange('list_test_a',0,-1);
$ret['src']['b']=$redis->lRange('list_test_b',0,-1);
print_r($ret);
?>

Array
(
    [exec] => Array
        (
            [a] => Array
                (
                    [0] => 1
                    [1] => 2
                    [2] => 3
                )
            [b] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                )
        )
    [src] => Array
        (
            [a] => Array
                (
                    [0] => value_a_3
                    [1] => value_a_2
                    [2] => value_a_1
                )
            [b] => Array
                (
                )
        )
)