Question

I am reading Survive the deep end. There I read the following section:

    $this->_mapper->save($entry);
    $this->assertEquals(123, $entry->id);

Code for mapper::save is as follows:

    public function save(ZFExt_Model_Entry $entry) {
    if(!$entry->id) {
        $data = array(
            'title' => $entry->title,
            'content' => $entry->content,
            'published_date' => $entry->published_date,
            'author_id' => $entry->author->id
        );
        $entry->id = $this->_getGateway()->insert($data);
                    ....contd

As you can see the variable is not passed by reference, then how the value will get changed in $entry in the calling function ? (i.e; $this->_mapper->save($entry); $this->assertEquals(123, $entry->id);)

Answer 1

Objects are always passed by reference.