<?php  
$___notjson = 1;
include 'libs.php';

$start_time = microtime(true);

$db = new DB();

$sql = "SELECT * FROM `freelancer` ORDER BY `rating` DESC LIMIT 2";
$users = $db->selectRows($sql);
print_r($users);

$end_time = microtime(true);
$time = round(($end_time - $start_time),5);  
echo $time;
?>

$db = new PDO('sqlite:example.db');

//Создание таблицы
$db->exec('CREATE TABLE IF NOT EXISTS users (     
               `user_id` INT(10) NOT NULL AUTOINCREMENT PRIMARY KEY,
               `username` VARCHAR(10) NOT NULL,
               `full_name` VARCHAR(100)  NOT NULL,     
               `group_id` INT(2) NOT NULL DEFAULT 1
)');

//Добавление
$db->exec("INSERT INTO `users` (username, full_name) VALUES ('Vasya', 'Вася')");

//Выборка
$stm = $db->query('SELECT * FROM `users` WHERE `user_id` = 1');
$user = $stm->fetch(PDO::FETCH_ASSOC);
print_r($user);

<?php  
$___notjson = 1;
$db = new PDO('sqlite:example.db');  

//Создание таблицы  
$db->exec('CREATE TABLE `users` (      
                `user_id` INT(10) NOT NULL AUTOINCREMENT PRIMARY KEY,  
                `username` VARCHAR(10) NOT NULL,  
                `full_name` VARCHAR(100)  NOT NULL,      
                `group_id` INT(2) NOT NULL DEFAULT 1  
)');  

//Добавление  
$db->query("INSERT INTO `users` (username, full_name) VALUES ('Vasya', 'Вася')");  

// Выборка  
$stm = $db->query('SELECT * FROM `users` WHERE `user_id` = 1');  
$user = $stm->fetch(PDO::FETCH_ASSOC);  
print_r($user);
?>