The documentation says:
Snippets are expanded at a very early stage on each template, making it possible for them to hold dynamic content, ExpressionEngine tags, other variables, PHP, etc.
The evidence seems to run contrary to that statement.
Can PHP be used in a snippet as it can in an embed when enabled?
The scenario: I have Google Analytics and other tracking code in a snippet. I want to wrap it in a simple PHP conditional to check for the live site URL, so I'm not hitting that code in my development/staging environment.