Since PHP LSAPI version 4.3, PHP LSAPI has been capable of generating formatted PHP source code in HTML, allowing users to view the source code for these files through a web browser.
You can set LSPHP to generate source code using the command line option -s. For example:
$SERVER_ROOT/fcgi-bin/lsphp5 -s
If you add -s at the end of the Command setting in the WebAdmin Console under Configuration > External App > your_external_application > Command, that external application will now generate PHP source code in HTML for the files it reads. A script handler can then be created under Configuration > Script Handler pointing to that external application. This will direct all files with a Suffix defined in that script handler (phpsc, for example) to the external application that will generate their source code.