Initial Commit

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@169824 c90b9560-bf6c-de11-be94-00142212c4b1

language/oop5/typehinting.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- $Revision: 1.1 $ -->
+ <sect1 id="language.oop5.typehinting">
+  <title>Type Hinting</title>
+  <para>
+   PHP 5 introduces Type Hinting. Methods are now able to force parameters
+   to be objects by specifying the name of the class in the function prototype.
+  </para>
+  
+  <example>
+   <title>Type Hinting example</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+class MyClass
+{
+    /**
+     * A test function
+     *
+     * First parameter must be an object of type OtherClass
+     */
+    public function test(OtherClass $otherclass) {
+        echo $otherclass->var;
+    }
+}
+
+class OtherClass {
+    public $var = 'Hello World';
+}
+
+$myclass = new MyClass;
+
+// These are fatal errors
+// Argument 1 must be an object of class OtherClass
+$myclass->test('hello');
+// Argument 1 must be an instance of OtherClass
+$foo = new stdClass;
+$myclass->test($foo);
+// Argument 1 must not be null
+$myclass->test(null);
+
+// This is fine
+$foo = new OtherClass;
+// Prints Hello World
+$myclass->test($foo);
+?> 
+]]>
+   </programlisting>
+  </example>
+ </sect1>
+ 
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"../../manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->