Document constant arrays in the migration guide.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@335317 c90b9560-bf6c-de11-be94-00142212c4b1

appendices/migration56/new-features.xml

@@ -5,7 +5,7 @@
  <title>New features</title>
 
  <sect2 xml:id="migration56.new-features.const-scalar-exprs">
-  <title>Constant scalar expressions</title>
+  <title>Constant expressions</title>
 
   <para>
    It is now possible to provide a scalar expression involving numeric and
@@ -41,6 +41,29 @@ echo C::SENTENCE;
 <![CDATA[
 4
 The value of THREE is 3
+]]>
+   </screen>
+  </informalexample>
+
+  <para>
+   It is also now possible to define a constant <type>array</type> using the
+   <literal>const</literal> keyword:
+  </para>
+
+  <informalexample>
+   <programlisting role="php">
+<![CDATA[
+<?php
+const ARR = ['a', 'b'];
+
+echo ARR[0];
+?>
+]]>
+   </programlisting>
+   &example.outputs;
+   <screen>
+<![CDATA[
+a
 ]]>
    </screen>
   </informalexample>