Because two Apache installations can not be installed into the same path, you have to use a different installation prefix for each different installation. In the examples that I show here I will compile PHP as a static module to Apache, as that is the best performing combination. It will take a little bit more time (15 seconds) to compile Apache too when upgrading PHP, but I can live with that.
Below I show a example configuration and compilation session of Apache and PHP. Everything in bold is something that you need to differ between different Installations on the same system.
cd apache-1.3.31 ./configure --prefix=/usr/local/php43 cd .. cd php-4.3.11 ./configure --prefix=/usr/local/php43 --with-apache=/dat/src/apache-1.3.31 <other options> make make install cd .. cd apache-1.3.31 ./configure --prefix=/usr/local/php43 --activate-module=src/modules/php4/libphp4.a --enable-module=rewrite --enable-module=proxy <other options> make make install
After setting it up for PHP 4.3, you can repeat the process above but change the 4.3.11 and /local/local/php43 to reflect PHP 4.4.
Normally Apache runs on port 80 and it is impossible to have two Apache instances using this same port of course.
The easiest way is by allowing two IP addresses to be bound to one server, but using different ports in combination with a proxy server works as well ofcourse. In the setup on my development machines I simply use different ports for different Apache/PHP versions, such as :14311 for PHP 4.3.11 and :1510 for PHP 5.1.0-dev.
As you now have two different configuration files, one as /usr/local/php43/conf/httpd.conf and one as /usr/local/php44/conf/httpd.conf you can make your adjustments there. For example if you have two different IP addresses - one for each Apache installation you can use this:
Listen 10.0.2.35:80
This will cause Apache only to bind to one of the IP addresses on the machine (10.0.2.35 in my example, but ofcourse you need to use an IP addresseble address like 212.204.192.51 here), and only to port 80. In the other installations' configuration you need to select the other IP:
Listen 10.0.2.36:80
You also need to update your DNS according to where you placed the vhost for a specific site.
If your server does not have the possibility to have more than one IP address, then you can deply a different setup. In this setup the configuration on the PHP 4.3 server contains all vhosts, but for the ones that are already moved to the PHP 4.4 server special apache configuration settings are added to redirect internally from the PHP 4.3 server to the PHP 4.4 one.
The configuration for the PHP 4.3 server should have the following statements:
Listen 10.0.2.35:80 NameVirtualHost 10.0.2.35.80
The listen statement for the PHP 4.4 server should be modified to that it listens at a different port than port 80:
Listen 127.0.0.1:8044 NameVirtualHost 127.0.0.1:8044
The vhost configuration of one of the sites that was moved to the PHP 4.4 server now looks in the PHP 4.3 server like:
<VirtualHost 10.0.2.35:80> ServerName site1.example.com DocumentRoot /usr/local/htdocs/ezpublish-site1 RewriteEngine On RewriteRule !\.(gif|css|jpg|png|jar|ico|js)$ /index.php </VirtualHost> <VirtualHost 10.0.2.35:80> ServerName site2.example.com ProxyPass / http://site2internal:8044/ </VirtualHost>
And in the PHP 4.4 server configuration like:
<VirtualHost 127.0.0.1:8044> ServerName site2internal DocumentRoot /usr/local/htdocs/ezpublish-site2 RewriteEngine On RewriteRule !\.(gif|css|jpg|png|jar|ico|js)$ /index.php </VirtualHost>
You need to make sure that site2internal is configured in your /etc/hosts file:
127.0.0.1 localhost site2internal
This should be all that you have to do in to run PHP 4.3 and PHP 4.4 concurrently. (Or any two other PHP versions ofcourse).