$ composer require upfor/juggler

<?phpuse Upfor\Juggler\Juggler;require 'vendor/autoload.php';// Config and connect server$config = array(    'host' => '127.0.0.1',    'port' => 3306,    'dbname' => 'db_name',    'username' => 'your_username',    'password' => 'your_password',    'charset' => 'utf8',    'prefix' => 'db_pre_',);$db = new Juggler($config);// SELECT `user_id`, `username` FROM `user` WHERE `user_id` >= 20$data = $db->table('user')->field(array('user_id', 'username'))->where('user_id|>=', 20)->getList();echo json_encode($data);