PHP排序数组函数

Question

I have a table that consists of comments. Some of them are replies to other comments and have a value set in parent_commentid table. I'm trying to create a function that checks each element in a result set if there is a value in the parent_columnid and if so take the entire element and sort it inside the element with a comment_id that matches the parent_commentid of the current element in the iteration. This is what I've come up with so far.

    function sort_comments($comments){
    $result = array();
    foreach($comments as $comment){
        if(is_null($comment['parent_commentid'])) $result[] = $comment;
        else{
            $parent_comment = array_search($comment['parent_commentid'], $comments);
            if($parent_array !== false) $result[$parent_comment][] = $comment;
        }
    }
}

array_search is not the function I'm looking for but is the closets thing I could think of. Im not sure where to go from here. Keep in mind also that there can exist replies to other replies.

Answer 1

You need to store the comments by their own id, so that you can reference them later:

function sort_comments($comments){
    $result = array();
    foreach($comments as $comment){
        if(is_null($comment['parent_commentid'])){ 
            $result[$comment['commentid']] = $comment;
        }else{
            $parent_comment = $result[$comment['parent_commentid']]
            if($parent_comment) 
                $parent_comment[$comment['commentid']] = $comment;
            else
                // what happens in this case:
                // parent_commentid set, but no such comment exists?
        }
    }

Note the $comment['commentid']. I don't know how you call the id of a comment (commentid ?), but since you have a column parent_commandid you most likely do have such a column to reference your comments. Use that to store the comments, on top level or inside other comments.