Fatal problem within my MySql queries - php

Question

I'm having a problem regarding these 3 queries:
select count(*) as rec_count from test_history inner join
test_detail on test_history.history_id = test_detail.test_history_id
where test_history.history_id in ({$_SESSION['history_ids']})
and test_history.user_id = $userID
and
select count(*) as correct_answers from test_history inner join test_detail
on test_history.history_id = test_detail.test_history_id
where test_history.history_id in ({$_SESSION['history_ids']}) and
test_history.user_id = $userID and is_correct = 1
and this one
select * from test_topics inner join
test_topics_link on test_topics.`topic_id` = test_topics_link.`topic_id`
where test_topics_link.test_id in ({$_SESSION['ids_tests']}) and percentage > 0
I'm always getting this 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 ') and
test_history.user_id = 82' at line 3
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 ') and
test_history.user_id = 82 and is_correct = 1' at line 2
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 ')' at line 1
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 ') and percentage > 0' at
line 3

Answer 1

Since $_SESSION['ids_tests'], I suppose, is an array, you should write implode(',',$_SESSION['ids_test']), e.g. in PHP it should be:
$query = "select * from test_topics inner join
test_topics_link on test_topics.`topic_id` = test_topics_link.`topic_id`
where test_topics_link.test_id in (".
implode(',',$_SESSION['ids_tests']).") and percentage > 0";