colder Sat Feb 24 11:19:24 2007 UTC
Modified files:
/phpdoc/en/language references.xml
Log:
Fix #40610 (Undefined variables get defined when used with references)
http://cvs.php.net/viewvc.cgi/phpdoc/en/language/references.xml?r1=1.46&r2=1.47&diff_format=u
Index: phpdoc/en/language/references.xml
diff -u phpdoc/en/language/references.xml:1.46
phpdoc/en/language/references.xml:1.47
--- phpdoc/en/language/references.xml:1.46 Fri Nov 18 16:20:48 2005
+++ phpdoc/en/language/references.xml Sat Feb 24 11:19:24 2007
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.46 $ -->
+<!-- $Revision: 1.47 $ -->
<chapter id="language.references">
<title>References Explained</title>
@@ -49,6 +49,32 @@
This is valid also for arrays passed by value to functions.
</para>
</note>
+ <note>
+ <para>
+ If you assign, pass or return an undefined variable by reference,
+ it will get created.
+ <example>
+ <title>Using references with undefined variables</title>
+ <programlisting role="php">
+<![CDATA[
+<?php
+function foo(&$var) { }
+
+foo($a); // $a is "created" and assigned to null
+
+$b = array();
+foo($b['b']);
+var_dump(array_key_exists('b', $b)); // bool(true)
+
+$c = new StdClass;
+foo($c->d);
+var_dump(property_exists($c, 'd')); // bool(true)
+?>
+]]>
+ </programlisting>
+ </example>
+ </para>
+ </note>
<para>
The same syntax can be used with functions, that return references,
and with <literal>new</literal> operator (in PHP 4.0.4 and later):
