Add a note about chaining assignments, responding to several user notes.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@287826 c90b9560-bf6c-de11-be94-00142212c4b1

language/oop5/overloading.xml

@@ -132,6 +132,16 @@
     <link linkend="language.oop5.static">static</link>.
    </para>
 
+   <note>
+    <para>
+     The return value of <literal>__set()</literal> is ignored
+     because of the way PHP processes the assignment operator.
+     Similarly, <literal>__get()</literal> is never called when
+     chaining assignemnts together like this:
+     <literal><![CDATA[ $a = $obj->b = 8; ]]></literal>
+    </para>
+   </note>
+
    <example>
     <title>overloading with __get, __set, __isset and __unset example</title>
     <programlisting role="php">