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ApacheMySQLPHP - Community Ubuntu Documentation
(via)Some applications require php4 while others will work with php5. Be sure to install the version of php and the corresponding apache2 module for it. You cannot have both php4 and php5 modules running on the same instance of apache2 at the same time. Installing one may remove the other.
If you have both php4 and php5 installed, be aware of which version of the apache2 php module you have. If libapache2-mod-php5 is already installed, the php4 package will install libapache-mod-php4 and not libapache2-mod-php4 package.