Get containing object - php

Question

I have two classes
class Table {
public $rows = array();
public $name;
public function __construct($name, $rows) {
$this->name = $name;
$this->rows = $rows;
}
}
class Row {
public $name;
public function __construct($name) {
$this->name = $name;
}
}
Now I want to create an object table and add 2 rows to it.
$rows = array(
new Row("Row 1"),
new Row("Row 2")
);
$table = new Table("Table 1", $rows);
So far so good..
But is there a possibility to get the containing table of a row?
For example:
foreach($table->rows AS $row) {
echo $row->name . ' is member of table ' . $row->getContainingTable()->name;
}
This is only an example...

Answer 1

You would have to change your Row class (pass the Table object to it):
class Row {
public $name;
protected $table;
public function __construct($name, Table $table) {
$this->name = $name;
$this->table = $table;
}
public function getContainingTable(){
return $this->table;
}
}
If you cannot do that on instantiation, create a setter method and use it after you pass the rows to the table :)
Actually, here's a better idea:
class Table {
public $rows = array();
public $name;
public function __construct($name, array $rows) {
$this->name = $name;
$this->rows = $rows;
foreach($rows as $row)
$row->setContainingTable($this);
}
}
class Row {
public $name;
protected $table;
public function __construct($name) {
$this->name = $name;
}
public function setContainingTable(Table $table){
$this->table = $table;
}
public function getContainingTable(){
return $this->table;
}
}

Answer 2

I think you should change your class structure to something like this
<?php
class MyCollection implements IteratorAggregate
{
private $items = array();
private $count = 0;
// Required definition of interface IteratorAggregate
public function getIterator() {
return new MyIterator($this->items);
}
public function add($value) {
$this->items[$this->count++] = $value;
}
}
$coll = new MyCollection();
$coll->add('value 1');
$coll->add('value 2');
$coll->add('value 3');
foreach ($coll as $key => $val) {
echo "key/value: [$key -> $val]\n\n";
}
?>
have a look at iterators in php 5 and see the examples this example is from there to