“Anonymous” is not the correct terminology when talking about objects. It would be better to say “object of anonymous type“, but this does not apply to PHP.
All objects in PHP have a class. The “default” class is
stdClass, and you can create objects of it this way:
$obj = new stdClass; $obj->aProperty = 'value';
You can also take advantage of casting an array to an object for a more convenient syntax:
$obj = (object)array('aProperty' => 'value'); print_r($obj);
However, be advised that casting an array to an object is likely to yield “interesting” results for those array keys that are not valid PHP variable names — for example, here’s an answer of mine that shows what happens when keys begin with digits.