Laravel 7 SQLSTATE [HY000] [2002]连接被拒绝

我的Laravel项目有问题。我是在几个小时前启动的，但遇到了SQL错误：

SQLSTATE[HY000] [2002] Connection refused
我已经呆了几个小时了，但我只发现密码或端口错误，但是我检查了一下，对我来说很好

这是.env文件：

DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3302
DB_DATABASE=test_technique
DB_USERNAME=root
DB_PASSWORD=

这是.env.example文件：

DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3302
DB_DATABASE=test_technique
DB_USERNAME=root
DB_PASSWORD=

这是database.php：

'mysql' => [
        'driver' => 'mysql',
        'url' => env('DATABASE_URL'),
        'host' => env('DB_HOST', 'localhost'),
        'port' => env('DB_PORT', '3302'),
        'database' => env('DB_DATABASE', 'test_technique'),
        'username' => env('DB_USERNAME', 'root'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'prefix_indexes' => true,
        'strict' => true,
        'engine' => null,
        'options' => extension_loaded('pdo_mysql') ? array_filter([
            PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
        ]) : [],
    ],

并检查mysql的端口：

Test for TCP
Your port 3302 is used by a processus with PID = 2292
The processus of PID 2292 is 'mysqld.exe' Session: Services
The service of PID 2292 for 'mysqld.exe' is 'N/A'
N/A means that there are no service related to PID 2292
Processus 'mysqld.exe' is launched by service 'wampmysqld64' with PID 5048

Test for TCPv6
Your port 3302 is used by a processus with PID = 2292
The processus of PID 2292 is 'mysqld.exe' Session: Services
The service of PID 2292 for 'mysqld.exe' is 'N/A'
N/A means that there are no service related to PID 2292
Processus 'mysqld.exe' is launched by service 'wampmysqld64' with PID 5048

我从未在mysql中更改过USERNAME和PASSWORD，所以我不知道为什么会出现此错误

PS：在另一个站点中，当我像这样使用PDO时，它可以工作：

new PDO("mysql:host=localhost:3302;dbname=test_technique;charset=utf8", "root", "",array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));