Description:
------------
If you try to give an object as parameter to a function by value, the object is not copied but passed by reference. So if you change the object in that function, you change your original object - after the function is returned you get still the changed object.
Shortly said:
function($myObject) and function(&$myObject)
are the same thing, which is wrong. All PHP-versions <5 i've had before (many 3.x and 4.x) does right.

Reproduce code:
---------------
<?php
function Test_FunctionParameter($myobj)
{
  $myobj->testattribute="Changed!";
}

class TestClass
{
  var $testattribute;
}

$testobj1=new TestClass;

$testobj2=new stdClass;
?>
<html>
<head>
<title><?php echo basename(__FILE__)."-".phpversion();?></title>
</head>
<body>
<h1><?php echo basename(__FILE__)."-".phpversion();?></h1>
<table border>
<tr>
<th></th><th>Original object:</th><th>Object after passing it by value(!) to a function which changes the attribute:</th>
</tr>
<tr>
<td>1. Self defined class</td>
<td><pre><code>
<?php
$testobj1->testattribute=3.14159265;
print_r($testobj1);
?>
</code></pre></td>
<td><pre><code>
<?php
Test_FunctionParameter($testobj1);
print_r($testobj1);
?>
</code></pre></td>
</tr>
<tr>
<td>2. pre defined stdClass</td>
<td><pre><code>
<?php
$testobj2->testattribute=array(1, 2, 3, 4);
print_r($testobj2);
?>
</code></pre></td>
<td><pre><code>
<?php
Test_FunctionParameter($testobj2);
print_r($testobj2);
?>
</code></pre></td>
</tr>
</table>
</body>
</html>

Expected result:
----------------
1. Self defined class 
Original object:
testclass Object
(
    [testattribute] => 3.14159265
)

Object after passing it by value(!) to a function which changes the attribute: 
testclass Object
(
    [testattribute] => 3.14159265
)

 
2. pre defined stdClass 
Original object:
stdClass Object
(
    [testattribute] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

)

Object after passing it by value(!) to a function which changes the attribute: 
stdClass Object
(
    [testattribute] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

)


Actual result:
--------------
1. Self defined class 
Original object:
testclass Object
(
    [testattribute] => 3.14159265
)

Object after passing it by value(!) to a function which changes the attribute: 
testclass Object
(
    [testattribute] => Changed!
)

 
2. pre defined stdClass 
Original object:
stdClass Object
(
    [testattribute] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

)

Object after passing it by value(!) to a function which changes the attribute: 
stdClass Object
(
    [testattribute] => Changed!
)