Coinstallable PHP Versions

Description of the project:

PHP 5.x co-installability is a big task in Debian. All packages would have to be renamed from php5 to php5.x, all conflicting binaries would have to be renamed and an /etc/alternatives/ system would have to be used to select the default PHP version. But that's the smaller part - the supporting infrastructure (namely dh_php5 and php5-maintscript-helper) would have to be modified to support multiple PHPAPI versions to allow compiling all external (and internal) PHP modules for all supported PHP versions.