Instant object iterator in PHP

If you want to have a class iterate over an array member:

<?php
class Foo implements IteratorAggregate {
    private $data = array();

    public function add($entry) {
        $data[] = $entry;
    }

    public function getIterator() {
        return new ArrayIterator($this->data)
    }
}

$foo = new Foo;
$foo->add('bar');
$foo->add('baz');

foreach($foo as $val) {
    echo "{$val}\n";
}

Outputs

bar
baz

That's the most common use case for the Traversible interface in PHP I'm encountering and it's much easier than implement the whole Iterator interface.

ou.jiayong.name

Instant object iterator in PHP