/**
* Concrete Abstraction Class
*/
class ExtendedListing extends Listing
{
function __construct($data_source)
{
parent::__construct($data_source);
}
function readWithEncode()
{
return htmlspecialchars($this->read(), ENT_QUOTES, mb_internal_encoding());
}
}
/**
* Client
*/
$list1 = new Listing(new FileDataSource('data.txt'));
$list2 = new ExtendedListing(new FileDataSource('data.txt'));
try {
$list1->open();
$list2->open();
} catch (Exception $e) {
die($e->getMessage());
}
$data = $list1->read();
echo $data;
$data = $list2->readWithEncode();
echo $data;
$list1->close();
$list2->close();