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php - MySQL SELECT rows between two values

I need to select data from a mysql database from the past 12 months based on the current date. I have the dates saved in the database as unix timestamps but my query does not seem to work.

$query="SELECT user_id, COUNT(first_name) AS member_count
FROM main_user
WHERE renew_date<'$time' AND renew_date>'$old_time' WHERE renew_date!=''";

Basically I need to count all instances of first_name where there is a renew_date timestamp.

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You have an additional WHERE where you should use AND:

$query="SELECT user_id, COUNT(first_name) AS member_count
FROM main_user
WHERE renew_date<'$time' AND renew_date>'$old_time' AND renew_date!=''";
                                                    ^^^

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