practice-oop/handler.php

<?php
/**
 * Created by PhpStorm.
 * User: artem
 * Date: 18.05.17
 * Time: 19:40
 */
require_once('lib/CallbackForm.php');
require_once('lib/FooterCallbackForm.php');

$name = isset($_POST['name']) ? trim($_POST['name']) : '';
$phone = isset($_POST['phone']) ? trim($_POST['phone']) : '';
$mail = isset($_POST['mail']) ? trim($_POST['mail']) : '';
$file = isset($_FILES['fileForm']) ? $_FILES['fileForm'] : '';
$formType = $_POST['formType'];

if ($formType == 'header_callback') {
    $form = new CallbackForm($name, $phone);
}

if ($formType == 'footer_callback') {
    $form = new FooterCallbackForm($mail, $phone, $name, $file);
}

if ($form->validate()) {
    $form->send();
} else {
    echo 'Введите корректные данные';
}