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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.11 $ -->
<chapter id="faq.migration4">
<title>Migrating from PHP 3 to PHP 4</title>
<titleabbrev>Migrating from PHP 3 to PHP 4</titleabbrev>
<para>
PHP has already a long history behind him :
Legendary PHP 1.0, PHP/FI, PHP 3.0 and PHP 4.0.
</para>
<qandaset>
<qandaentry id="faq.migration4.php34">
<question>
<para>
Migrating from PHP 3 to PHP 4
</para>
</question>
<answer>
<para>
PHP 4 was designed to be as compatible with earlier versions of
PHP as possible and very little functionality was broken in the
process. If you're really unsure about compatibility you should
install PHP 4 in a test environment and run your scripts there.
</para>
<para>
Also see the <link linkend="migration4">appropriate migration
appendix</link> of this manual.
</para>
</answer>
</qandaentry>
<qandaentry id="faq.migration4.sessions">
<question>
<para>
Do sessions work in PHP 3?
</para>
</question>
<answer>
<para>
Although <link linkend="ref.session">native session support</link>
didn't exist in PHP 3, there are third-party applications that did
(and still do) offer session functionality. The most common method
was by using <ulink url="&url.phplib;">PHPLIB</ulink>.
</para>
</answer>
</qandaentry>
<qandaentry id="faq.migration4.incompatible">
<question>
<para>
Incompatible functions?
</para>
</question>
<answer>
<para>
Since PHP 4 is basically a rewrite of the entire PHP engine there
were very few functions that were altered and only then some of
the more exotic ones.
</para>
</answer>
</qandaentry>
</qandaset>
</chapter>
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