php Class DataHolder protected data array Class composer extends DataH

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<?php
Class DataHolder {
protected $data = array();
}
Class composer extends DataHolder {
public function __construct (array $resource)
{
$this->resource = $resource;
}
public function compile ()
{
foreach ($this->resource as $r)
{
$r->compile();
}
}
public function write ()
{
print_r($this->data);
}
}
Class data1 extends DataHolder {
public function compile ()
{
$this->data[] = 'a';
}
}
Class data2 extends DataHolder {
public function compile ()
{
$this->data[] = 'b';
}
}
Class data3 extends DataHolder {
public function compile ()
{
$this->data[] = 'c';
}
}
$r = new composer(array(
new data1,
new data2,
new data3
));
$r->compile();
$r->write();
?>