i'm sorry i have just read your reply, but actually, i can't understand about your answer
It's not you it is him, most people who know what they are on about find it hard to follow this member.
What is being said is that you can feed the LDR into a digital pin, but then you will only get high and low readings, even then it is not very stable so scrub that one.
Second the suggestion of making some sort of analogue to digital converter by seeing how long it takes a capacitor to discharge is valid but a bit fiddley. As you have seen things have to be just right for it to work.
The best way is to use an analogue multiplexer on the A/D input but you seem to have this ruled out for some reason.
What type of LDR do you have? There are many and have different resistance ranges.