Problems…

Database error: [You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near ",,,,,,,,,,,,,,,,,,,,,,]
SELECT DISTINCT ID, category_id, cat_name, category_nicename, category_description, category_parent FROM wp_categories, wp_post2cat, wp_posts WHERE category_id = cat_ID AND post_id = ID AND post_id IN (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,)

Warning: Invalid argument supplied for foreach() in /hsphere/local/home/zackdesi/nfo.zackdesign.biz/wp/wp-blog-header.php on line 478

Database error: [You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near “,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,]
SELECT ID, COUNT( comment_ID ) AS ccount FROM wp_posts LEFT JOIN wp_comments ON ( comment_post_ID = ID AND comment_approved = “1”) WHERE post_status = “publish” AND ID IN (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) GROUP BY ID

Database error: [You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,]
SELECT post_id,meta_key,meta_value FROM wp_postmeta WHERE post_id IN(,,,,,,,,,,,,,,,,,) ORDER BY post_id,meta_key

Fatal error: Call to undefined function: array() in /hsphere/local/home/zackdesi/nfo.zackdesign.biz/wp/wp-includes/functions.php on line 1122`

I thought I should put the entire lot in to make it easier to see what I mean…

I recently found that someone had hacked my site and added some popups that would install viruses. It seemed as if he’d only changed the index.php page, so I fixed that and everything was fine, for a day or two. Then, suddenly I find that the above error codes appear. What do they mean and how do you fix them? I have already checked that all the categories are used, etc., etc.