cvs: phpdoc /en/appendices migration4.xml

nohn Sun Feb 24 12:03:56 2002 EDT Modified files: /phpdoc/en/appendices migration4.xml Log: fixing bug #15696 Index: phpdoc/en/appendices/migration4.xml diff -u phpdoc/en/appendices/migration4.xml:1.18 phpdoc/en/appendices/migration4.xml:1.19 --- phpdoc/en/appendices/migration4.xml:1.18 Thu Jan 17 22:32:22 2002 +++ phpdoc/en/appendices/migration4.xml Sun Feb 24 12:03:54 2002 @@ -1,5 +1,5 @@ <?xml version="1.0" encoding="iso-8859-1"?> -<!-- $Revision: 1.18 $ --> +<!-- $Revision: 1.19 $ --> <appendix id="migration4"> <title>Migrating from PHP 3 to PHP 4</title> @@ -421,6 +421,33 @@ strange to understand that it deserved a change to prevent further problems in the future. </para> + </section> + + <section id='migration4.variables'> + <title>Handling of global variables</title> + <para> + While handling of global variables had the focus on to be easy in + PHP3 and early versions of PHP4, the focus has changed to be more + secure. While in PHP3 following example worked fine, in PHP4 it + has to be unset($GLOBALS["id"]);. This is only one issue of global + variable handling. You should always have used $GLOBALS, with + newer versions of PHP4 you are forced to do so in most cases. + </para> + <example> + <programlisting role="php"> +<![CDATA[ +<?php +$id=1; +function test() +{ + global $id; + unset($id); +} +test(); +echo($id); +]]> + </programlisting> + </example> </section> </appendix>