Let an object loop as array with a foreach() by extending ArrayObject

Question

So I have an object which contains a set of objects in a private data member. I can now loop it with a for loop by overriding the count() function of an ArrayObject and offsetGet($index), but I also want to loop it within a foreach loop.

What functions do I need to minimally extend to add this functionality?

score 3 · Accepted Answer · answered Jun 15 '12 at 12:14

3

Use the SPL Iterator Interface see http://uk.php.net/manual/en/class.iterator.php for details

answered Jun 15 '12 at 12:14

Rufinus

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score 2 · Answer 2 · answered Jun 15 '12 at 12:17

2

AFAIK You can use directly foreach on ArrayObject:

$ao = new ArrayObject(array(1, 2, 3, 4));
$res = 0;
foreach($ao as $el) {
    $res += $el;
}
echo 'ArrayObject elements sum: '.$res;

SAMPLE: http://codepad.org/uQDGQ03A

answered Jun 15 '12 at 12:17

shadyyx

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3

An object can be used with a foreach loop when it a) is an array or b) implements the Traversable interface. ArrayObject implements this interface (see http://php.net/manual/class.traversable.php). – Niko Jun 15 '12 at 12:21

Let an object loop as array with a foreach() by extending ArrayObject

2 Answers2