Fixed bug #53133 (Scope of use keyword is not documented)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@304702 c90b9560-bf6c-de11-be94-00142212c4b1

language/namespaces.xml

@@ -681,6 +681,42 @@ $obj = new \Another\thing; // instantiates object of class Another\thing
     </programlisting>
    </example>
   </para>
+  <sect2 xml:id="language.namespaces.importing.scope">
+   <title>Scoping rules for importing</title>
+   <para>
+    The <literal>use</literal> keyword must be declared in the 
+    outermost scope of a file (the global scope) or inside namespace 
+    declarations. This is because the importing is done at compile 
+    time and not runtime, so it cannot be block scoped. The following 
+    example will show an illegal use of the <literal>use</literal> 
+    keyword:
+   </para>
+   <para>
+    <example>
+     <title>Illegal importing rule</title>
+     <programlisting role="php">
+<![CDATA[
+<?php
+namespace Languages;
+
+class Greenlandic
+{
+	use Languages\Danish;
+
+	...
+}
+?>
+]]>
+     </programlisting>
+    </example>
+   </para>
+   <note>
+    <para>
+     Importing rules are per file basis, meaning included files will 
+     <emphasis>NOT</emphasis> inherit the parent file's importing rules.
+    </para>
+   </note>
+  </sect2>
  </sect1>
  <sect1 xml:id="language.namespaces.global">
   <title>Global space</title>