Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource?

You are overwriting the $result variable that controls the loop within the loop. That's not good. The database resource contains a cursor that you must consume fully or otherwise dispose of just overwriting it with a new result may not get you the expected results (or indeed get you a runtime error).

Your query must have a problem which is causing $result to be an invalid resource.

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