Slim PHP Framework : DB Connection Sample

database.php

<?php

namespace Database {
    class Db
    {
        private $servername = "localhost";
        private $username = "root";
        private $password = "";
        private $database = "";
        public $conn = "";

        public function _construct()
        {
            try {
                $this->conn = new \PDO("mysql:host=$this->servername;dbname=$this->database", $this->username, $this->password,
                    array(\PDO::MYSQL_ATTR_INIT_COMMAND));
                // set the \PDO error mode to exception
                $this->conn->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
                $this->conn->exec("set names utf8");
                // echo "Connected successfully";
            } catch (\PDOException $e) {
                echo "Connection failed: " . $e->getMessage();
            }
        }
}

test_database.php

<?php 

  include "Db.php";
  $db = new \Database\Db();
  $db->_construct();

?>