Fix #37880 (members' default value)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@216628 c90b9560-bf6c-de11-be94-00142212c4b1

language/oop5/basic.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.16 $ -->
+<!-- $Revision: 1.17 $ -->
 
  <sect1 id="language.oop5.basic">
   <title>The Basics</title>
@@ -84,6 +84,37 @@ class SimpleClass
     </programlisting>
    </example>
 
+   <para>
+    The default value must be a constant expression, not (for example) a
+    variable, a class member or a function call.
+    <example>
+     <title>Class members' default value</title>
+     <programlisting role="php">
+<![CDATA[
+<?php
+class SimpleClass
+{
+    // invalid member declarations:
+    public $var1 = 'hello '.'world';
+    public $var2 = <<<EOD
+hello world
+EOD;
+    public $var3 = 1+2;
+    public $var4 = self::myStaticMethod();
+    public $var5 = $myVar;
+
+    // valid member declarations:
+    public $var6 = myConstant;
+    public $var7 = self::classConstant;
+    public $var8 = array(true, false);
+    
+    
+}
+?>
+]]>
+     </programlisting>   
+    </example>
+   </para>
    <note>
     <para>
     There are some nice functions to handle classes and objects. You might want