Fetch table names from query

Is there any simple way to extract the table names of a given SELECT 
query without actually running it?

I've implemented a very simple results cache in my PHP application but 
I'd like to improve it. And one of the key points is finding out what 
tables a query reads from so I can handle obsolete data. Writing a 
reliable SQL parser in PHP looks like a hard task and obtaining a full 
explain plan from the Oracle server looks like an overkill.

Any ideas?

Thank you in advance,


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