added note to explain unset() doesn't change maximum index value.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@131464 c90b9560-bf6c-de11-be94-00142212c4b1

language/types.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.114 $ -->
+<!-- $Revision: 1.115 $ -->
  <chapter id="language.types">
   <title>Types</title>
 
@@ -1391,6 +1391,26 @@ unset($arr);    // This deletes the whole array
        </programlisting>
       </informalexample>
      </para>
+     <note>
+      <para>
+       If you omit a key, the maximum of the integer-indices is taken, and
+       the new key will be that maximum + 1.  
+       Note that the maximum is same when the element having
+       maximum-index was cleared using <function>unset</function> function.
+       <informalexample>
+        <programlisting role="php">
+<![CDATA[
+<?php
+$a = array("orange","apple","banana");
+unset($a[2]); // clear $a[2]
+$a[] = 'carrot'; // assign a new value without key 
+var_dump($a); // output: array(0 => 'orange', 1 => 'apple', 3 => 'carrot')
+?>
+]]> 
+        </programlisting>
+       </informalexample>       
+      </para>
+     </note>
     </sect3>
    </sect2><!-- end syntax -->