To supplement an example with an assignment without & for &-function (#4557)

* references.xml To supplement an example with an assignment without & for &-function

* Update references.xml Move comments after assignment

* Update references.xml Clarify the wording

language/references.xml

@@ -490,12 +490,26 @@ function &collector()
 }
 
 $collection = &collector();
+// Now the $collection is a referenced variable that references the static array inside the function
+
 $collection[] = 'foo';
 
+print_r(collector());
+// Array
+// (
+//    [0] => foo
+// )
+
 ?> 
 ]]>
      </programlisting>
     </informalexample>
+   <note>
+    <simpara>
+     If the assignment is done without the <literal>&amp;</literal> symbol, e.g. <code>$collection = collector();</code>,
+     the <varname>$collection</varname> variable will receive a copy of the value, not the reference returned by the function.
+    </simpara>
+   </note>
    To pass the returned reference to another function expecting a reference
    you can use this syntax:
     <informalexample>