Multidimensional array PHP from MYSQL query - php

Question

I have the following tables in MYSQL:
CommentTable with columns: comment, commenter, datecommented and postid
PostTable with columns: postid, dateposted
I perform this query in php
Select commentTable.comment, commentTable.commenter, commentTable.datecommented, shareTable.postid, shareTable.dateshared from shareTable Left Join commentTable on commentTable.postid = shareTable.postid where shareTable.postid IN ($postidarray) order by shareTable.dateshared desc
where $postid array is an array of post ids.
The problem I have is when i'm trying to sort the query result into a multidimensional array.
I would want to have a multidimensional array called comment which would like this
Comment{
[0] {
[0] => "Comment 1 from first key in $postidaray"
[1] => "Comment 2 from first key in $postidarray"
}
[1] {
[0] => "Comment 1 from second key in $postidarray"
} // assuming there is only one comment for the second key in $postidarray
[2]{
[0] => "Comment 1 from third key in $postidarray"
[1] => "Comment 2 from third key in $postidarray"
[2] => "Comment 3 from third key in $postidarray"
[3] => "Comment 4 from third key in $postidarray"
}
// assuming there are 4 comments for the third key in $postidarray
}
}
I'm doing this so that when I make a php echo I can loop out the comments relating to the specific post
For instance comment[0][1] would echo 'Comment 2 from first key in $postidarray'
Any help is appreciated.

Answer 1

You could do an ORDER BY shareTable.postId THEN BY shareTable.dateshared DESC
This would make all the rows with the same postId appear together so you could just check for a change of postId.
$i=-1;
$currentPostId=0;
$comment = array();
while($assoc = mysql_fetch_assoc($res)){
if($assoc['postId']!=$currentPostId){
$currentPostId = $assoc['postId'];
$i++;
}
$comment[$i][] = $res;
}
This should give you the result you want.
Alternately, If you use PDO, Use a prepared statement instead of using a single query with IN( ... )
$stmt = $pdo->prepare("Select ... shareTable.postid=? order by ShareTable.dateshared desc");
$comment = array();
$p = &$postIds[0];
$stmt->bindParam($p);
foreach($postIds as $p){
$stmt->execute();
$comment[] = $stmt->fetchAll(PDO::FETCH_ASSOC);
}