diff --git a/functions/array.xml b/functions/array.xml
index 996848db5b..992a3b5c8b 100644
--- a/functions/array.xml
+++ b/functions/array.xml
@@ -1378,7 +1378,11 @@ echo "sum(b) = ".array_sum($b)."\n";
      <function>array_unique</function> takes input
      <parameter>array</parameter> and returns a new array
      without duplicate values.
-     Note that keys are preserved.
+    </para>
+    <para>
+     Note that keys are preserved. <function>array_unique</function> will
+     keep the first key encountered for every value, and ignore all
+     following keys.
     </para>
     <para>
      <example>
@@ -1386,12 +1390,40 @@ echo "sum(b) = ".array_sum($b)."\n";
       <programlisting role="php">
 $input = array ("a" =&gt; "green", "red", "b" =&gt; "green", "blue", "red");
 $result = array_unique ($input);
+print_r($result);
+// this will output :
+//Array
+//(
+//    [a] => green
+//    [0] => red
+//    [1] => blue
+//)
       </programlisting>
      </example>
     </para>
     <para>
-     This makes <varname>$result</varname> have <literal>array ("a" =&gt;
-     "green", "red", "blue");</literal>.
+     Note that <function>array_unique</function> take into account
+     value's type. This is usually of no matter, except when it
+     comes to compare numbers, which can be of several types. 
+     This may lead to confusing results.
+    </para>
+    <para>
+     <example>
+      <title><function>array_unique</function> and types</title>
+      <programlisting role="php">
+$input = array (4,"3",3,"4",4,4);
+$result = array_unique ($input);
+print_r($result);
+// this will output :
+//Array
+//(
+//  [0] => 3
+//  [1] => 3
+//  [2] => 4
+//  [3] => 4
+//)
+      </programlisting>
+     </example>
     </para>
    </refsect1>
   </refentry>