Description:
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In chapter 13 "Classes and objects" there is an example of non-valid and valid initializers:
<?php
/* None of these will work in PHP 4. */
class Cart
{
    var $todays_date = date("Y-m-d");
    var $name = $firstname;
    var $owner = 'Fred ' . 'Jones';
    var $items = array("VCR", "TV");
}
...

Actually, the initializer of $items varaible works at least in PHP 4.3.3. It may also work in previous versions as I haven't found any news in ChangeLog related to it.