Retrieve JForm post data with JInput

sample.php

<?php

// Required objects
$input = JFactory::getApplication()->input;

// Get the form data
$formData = new JRegistry($input->get('jform', '', 'array'));

// Get any data being able to use default values
$id    = $formData->get('id', 0);
$name  = $formData->get('name', null);
$email = $formData->get('email', null);