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one important thing to note is that it has not aggregated the private elements defined in the class, which are present in the $ws object.
we will now consider the output to understand some of the side-effects and limitation of object aggregation in php. first, the newly created $fs and $ws objects give the expected output (according to their respective class declaration). note that for the purposes of object aggregation, private elements of a class/object begin with an underscore character ("_"), even though there is not real distinction between public and private class/object elements in php.
$fs object class: filestorage property: data (array) 0 = 3.1415926535898 1 = kludge != cruft method: filestorage method: write $ws object class: wddxstorage property: data (array) 0 = 3.1415926535898 1 = kludge != cruft property: version = 1.0 property: _id = id::9bb2b640764d4370eb04808af8b076a5 method: wddxstorage method: store method: _genid
예 4. test_aggregation.php