Wordpress mysql query no accepting variable - php

Question

I have been trying to code a mysql query in wordpress but it does not seem to work.
code:
foreach ($postList as $curpostid) {
echo "postID ".$curpostid." + ";
$sql2 = 'SELECT * FROM wp_mr_rating_item_entry WHERE post_id='.$curpostid;
$results2 = $GLOBALS['wpdb']->get_results($sql2) or die(mysql_error());
}
$postList prints as:
Array
(
[0] => 3148
[1] => 3097
[2] => 3048
[3] => 1036
)
These post ids do exist, and the echo shows them up fine. If I enter a specific value for $curpostid as one of the array entries the query works. It seems the query is not accepting the variable form the array.
I have tried making the variable as int (int)$curpostid since the field type is bigint but still not working.
Any help appreciated.
I have managed to place the output in a multidimensional array, but now I am not able to place the values in a single array:
this is the array:
Array
(
[0] => Array
(
[0] => stdClass Object
(
[rating_item_entry_id] => 1
)
[1] => stdClass Object
(
[rating_item_entry_id] => 2
)
[2] => stdClass Object
(
[rating_item_entry_id] => 3
)
[3] => stdClass Object
(
[rating_item_entry_id] => 4
)
[4] => stdClass Object
(
[rating_item_entry_id] => 5
)
[5] => stdClass Object
(
[rating_item_entry_id] => 6
)
[6] => stdClass Object
(
[rating_item_entry_id] => 7
)
[7] => stdClass Object
(
[rating_item_entry_id] => 8
)
)
[1] => Array
(
[0] => stdClass Object
(
[rating_item_entry_id] => 10
)
)
[2] => Array
(
[0] => stdClass Object
(
[rating_item_entry_id] => 11
)
)
[3] => Array
(
[0] => stdClass Object
(
[rating_item_entry_id] => 14
)
)
)
How can I place all the final rating_item_entry_id values in a single array?
Have tried with following code but I am bit confused and its not working.
foreach($results2Array as $result2) {
foreach($result2 as $res2) {
echo $res2['rating_item_entry_id'];
$ratingentries[] = $res2['rating_item_entry_id'];
}
}

Answer 1

Try this:
foreach ($postList as $curpostid) {
$sql2 = "SELECT * FROM wp_mr_rating_item_entry WHERE post_id='".$curpostid."'"; //change here
$results2 = $GLOBALS['wpdb']->get_results($sql2) or die(mysql_error());
}