通过for-each循环显示数据库

Question

I am trying to display a database using a for-each loop, however each of my get methods are highlighted and display that they cannot be found in my other class. I am very new to PHP and have no idea why this error is occurring.

For-Each Loop:

    <?php foreach ($view->productDataSet as $productData) {
             echo '<td>'.$productData->getProductID().
            '</td><td>'.$productData->getProductName().
            '</td><td>'.$productData->getProductPrice().
            '</td><td>'.$productData->getProductDesc().
            '</td><td>'.$productData->getProductManufacturer().
            '</td><td>'.$productData->getQuantity().
            '</td><td>'.'<img src="images/'.$productData->getPhotoName().'"   alt="no picture"/>'.
             '</td> </td>';
     } ?>
     </tbody>

I believe the problem is occurring in the line $view->productDataSet as $productData however I don't really know what this line of code means. The class below is my productDataSet class which calls the sql query that should display the table.

class ProductsDataSet {
protected $_dbHandle, $_dbInstance;

public function __construct() {
    $this->_dbInstance = Database::getInstance();
    $this->_dbHandle = $this->_dbInstance->getdbConnection();
}

public function fetchAllProducts() {
    $sqlQuery = 'SELECT * FROM products';

    echo $sqlQuery;

    $statement = $this->_dbHandle->prepare($sqlQuery); // prepare a PDO statement
    $statement->execute(); // execute the PDO statement

    $dataSet = [];
    while ($row = $statement->fetch()) {
        $dataSet[] = new ProductData($row);
    }
    return $dataSet;
}

Sorry if this is isn't set out well. Any ideas?