Opening php files on Android from Google drive

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http://androidforums.com – I installed Google Drive onto my Android. I have php files in my Google drive. I can see them on my Android in the Google Drive app. But, when I click on them to open them, it says I don't have a viewer. However, I installed Webmaster lite. I should be able to at least use that to open them. If I click on an html file from Google Drive, I get prompted to open this with the Firefox app I downloaded or the default html viewer. I expected the same prompt for the php files. Any ideas on how I can open the php files in this case? (General)