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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Appendix J. Setting up PHP5 in parallel with PHP4 in SuSE 10.1</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="pt09.html" title="Part IX. Appendices"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix J. Setting up PHP5 in parallel with PHP4 in SuSE 10.1</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Part IX. Appendices</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="appendix" title="Appendix J. Setting up PHP5 in parallel with PHP4 in SuSE 10.1"><div class="titlepage"><div><div><h2 class="title"><a name="app.setting-up-parallel-servers"></a>Appendix J. Setting up PHP5 in parallel with PHP4 in SuSE 10.1</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="apj.html#id2654187">J.1. Configuration files and directories for Apache2 in SuSE 10.1</a></span></dt><dt><span class="section"><a href="apjs02.html">J.2. Making sure you have the correct Apache2 setup</a></span></dt><dt><span class="section"><a href="apjs03.html">J.3. Approaches to running multiple PHP versions</a></span></dt><dt><span class="section"><a href="apjs04.html">J.4. Outline of the remainder of the chapter</a></span></dt><dt><span class="section"><a href="apjs05.html">J.5. Part I - Installing PHP4</a></span></dt><dd><dl><dt><span class="section"><a href="apjs05.html#id2654605">J.5.1. Step one; Compiling PHP4 as a module for Apache2</a></span></dt><dt><span class="section"><a href="apjs05.html#id2654607">J.5.2. Step two; Enable the PHP4 module in the Apache2 configuration</a></span></dt></dl></dd><dt><span class="section"><a href="apjs06.html">J.6. Part II - Creating a virtual host</a></span></dt><dd><dl><dt><span class="section"><a href="apjs06.html#id2654980">J.6.1. Step 1; Adding an alias IP-address to Your server</a></span></dt><dt><span class="section"><a href="apjs06.html#id2654984">J.6.2. Step 2; Creating different document and cgi roots</a></span></dt><dt><span class="section"><a href="apjs06.html#id2655010">J.6.3. Step 3; Configure Apache with a virtual host</a></span></dt></dl></dd><dt><span class="section"><a href="apjs07.html">J.7. Part III - Installing PHP5</a></span></dt><dt><span class="section"><a href="apjs08.html">J.8. Part IV - Verifying the setup</a></span></dt><dd><dl><dt><span class="section"><a href="apjs08.html#id2655206">J.8.1. Troubleshooting</a></span></dt></dl></dd></dl></div>
<p>Even though PHP4 is officially deprecated and is no longer actively maintained a large
number of existing installations are stiil (and will be) using PHP4. For this reason it can
be important to be able to test scripts running both PHP4 and PHP5. This section shows how
to do this on Linux SuSE 10.1 installation. Other Linux dialects can use similar but not
identical setups.</p>
<p>SuSE 10.1 ships with Apache2 and PHP5 as standard. In order to install PHP4 in parallel
some extra work is therefore required. This chapter explains how to setup both PHP4 and PHP5
on the same server by configuring Apache2 using virtual hosts. </p>
<p>We will show how to maintain a simultaneous installation of both PHP4 and PHP5 at the same
time without the need to run a switching script to select which PHP version to activate. In
this setup we have opted to configure Apache with two virtual hosts based on IP-address, one
host running PHP4 as a SAPI module and the other virtual host running PHP5 as a CGI
module.</p>
<div class="section" title="Configuration files and directories for Apache2 in SuSE 10.1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2654187"></a>Configuration files and directories for Apache2 in SuSE 10.1</h2></div></div></div>
<p>Before we start we give a short overview of where important configuration files and
directories for Apache2 are located in SuSE </p>
<p>
</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>The configuration files setup by SuSE is slightly different from the standard
one-single "/etc/httpd.conf" used by other systems. The way SuSE does it is to
create a hierarchy of setup files under "/etc/apache2/". While this might look
complicated at first sight it has several advantages specially when You consider
that some script have to modify and add configurations to Apache2. Doing
automatic (and safe) edits in a large config file that can also be manually
edited is almost impossible to guarantee. </p>
</div><p>
</p>
<p>
</p><div class="variablelist"><dl><dt><span class="term">Dir: /etc/apache2/</span></dt><dd>
<p>General configuration directory for Apache2, this is where the
"<code class="filename">httpd.conf</code>" lives. </p>
</dd><dt><span class="term">Dir: /etc/apache2/conf.d/</span></dt><dd>
<p>Module configuration files for loaded modules, for example php4.conf.
All the configuration files in this directory will be automatically read
by the main <code class="filename">httpd.conf</code> by means of an
"<code class="code">include conf.d/*.conf</code>" command so the exact name
doesn't really matter as long as the file ends in "<code class="code">*.conf</code>".
</p>
</dd><dt><span class="term">Dir: /etc/apache2/vhosts.d/</span></dt><dd>
<p>Virtual host configuration files. All files in this directory will be
automatically read by the main <code class="filename">httpd.conf</code> the exact
name doesn't really matter as long as the file ends in
"<code class="filename">*.conf</code>". Note: When yast2 is used to edit
virtual hosts it will add its "<code class="filename">yast2_*.conf</code>" in
this directory. Unfortunately the virtual host configuration in yast2 in
not without problem (bugs) for IP based virtual hosts so we prefer to
create the configuration files manually. This will be shown later on in
this article. </p>
</dd><dt><span class="term">File: /etc/sysconfig/apache2</span></dt><dd>
<p>This is the main Apache2 configuration file. This file is the one that
is really used to configure apache when it is started. This is also the
file that the "Yast2" HTTPD-module edits. </p>
<p>From our point of view the most important thing is that this is the
place where we tell Apache2 what external modules to load. </p>
<p>In the SuSE configuration this is done by listing all the modules in
the string variable <code class="code">APACHE_MODULES</code>. In the SuSE
configuration there are no static "AddModule" directives in any of the
configuration files for Apache. Instead this is dynamically generated
each time apache is started (for example by /etc/init.d/apache2 start) </p>
<p>The generation of the actual module file names is quite clever in that
the script looks at the core module name in the
<code class="code">APACHE_MODULE</code> variable and automatically determines the
name of the file name of the load modules. This means that for PHP we
only have to give the name "php4" or "php5" as the name of the module. </p>
<p>The script will then discover that the name of the file load module is
in fact "<code class="filename">libphp4.so</code>" or
"<code class="filename">libphp5.so</code>" automatically. The dynamically
created list of load modules will be written to
"<code class="filename">/etc/apache2/sysconfig/loadmodule.conf</code>" just
before the startup script activates apache2 daemon which will then read
the modules from this file which is included from the main
"<code class="filename">httpd.conf</code>" file. </p>
</dd></dl></div><p>
</p>
</div>
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