PHP DevCenter: Installing PHP as an Apache DSO
March 22, 2001
"One useful feature provided by the tight integration of PHP with Apache is the ability to install PHP as a dynamically loadable Apache module. This is a systems administrator's dream because it allows developers to upgrade PHP without having to recompile Apache. If you have ever gone through the 1.5 million steps required to install ApacheSSL, you can appreciate the value in this option."
"... The next time a new version, sub-version, or patch-level of PHP is released, you'll only need to recompile PHP."