<?php

class fooObject {

  private $dbConnexion;
  private $tableName = "my_table";

  public $foo;
  public $foo2;

  public function __construct($db) {
    $this->dbConnexion = $db;
  }

  function create() {
    try {
      $sql = "INSERT INTO " . $this->tableName . " SET foo = :foo, foo2 = :foo2";

      $query = $this->dbConnexion->prepare($sql);
      $query->bindParam(":foo", $this->foo, PDO::PARAM_STR);
      $query->bindParam(":foo2", $this->foo2, PDO::PARAM_STR);
      $query->execute();
    } catch (PDOException $e){
      echo 'PDOException : ' . $e->getMessage();
    }
  }
}

class DbConnect
{
  private $host = "localhost";
  private $db_name = "base";
  private $username = "root";
  private $password = "";
  public $dbConnexion;

  // get the database connection
  public function getConnection(){
    $this->dbConnexion = null;
    try{
      $this->dbConnexion = new PDO("mysql:host={$this->host};dbname={$this->db_name}", $this->username, $this->password);
      $this->dbConnexion->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }catch(PDOException $e){
      echo "Connection error: " . $e->getMessage();
    }
    return $this->dbConnexion;
  }
}

date_default_timezone_set('Europe/Paris');

$dataBase = new DbConnect();
$db = $dataBase->getConnection();

$object = new fooObject($db);

if (isset($_POST['saveToDb'])) {
  print_r($_REQUEST);
  $object->foo = $_POST['foo'];
  $object->foo2 = $_POST['foo2'];

  $object->create();
}