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I have looked at merging recursive in inner arrays but the is not going so well.

I am trying to get the array below to make a multidimensional array by nesting comments with comment_ID that is equal to comment_parent.

Desired result: Each comment with the comment_id == comment_parent should nest inside.

<?php $comments = array( array( 'comment_ID' => '4', 'comment_post_ID' => '1', 'comment_author' => 'cc', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'http://localhost:10004', 'comment_author_IP' => '127.0.0.1', 'comment_date' => '2021-01-08 15 =>59 =>28', 'comment_date_gmt' => '2021-01-08 15 =>59 =>28', 'comment_content' => 'Surely I am the second level comment in queue.', 'comment_approved' => '1', 'comment_parent' => '1', 'comment_karma' => '0', 'comment_agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv =>84.0) Gecko/20100101 Firefox/84.0', 'comment_type' => 'comment', 'user_id' => '1' ), array( 'comment_ID' => '3', 'comment_post_ID' => '1', 'comment_author' => 'cc', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'http://localhost:10004', 'comment_author_IP' => '127.0.0.1', 'comment_date' => '2021-01-08 15 =>58 =>38', 'comment_date_gmt' => '2021-01-08 15 =>58 =>38', 'comment_content' => 'I am third level comment', 'comment_approved' => '1', 'comment_parent' => '2', 'comment_karma' => '0', 'comment_agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv =>84.0) Gecko/20100101 Firefox/84.0', 'comment_type' => 'comment', 'user_id' => '1' ), array( 'comment_ID' => '2', 'comment_post_ID' => '1', 'comment_author' => 'cc', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'http://localhost:10004', 'comment_author_IP' => '127.0.0.1', 'comment_date' => '2021-01-08 15 =>49 =>52', 'comment_date_gmt' => '2021-01-08 15 =>49 =>52', 'comment_content' => 'I am a second level comment for the first one. Hello world comment.', 'comment_approved' => '1', 'comment_parent' => '1', 'comment_karma' => '0', 'comment_agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv =>84.0) Gecko/20100101 Firefox/84.0', 'comment_type' => 'comment', 'user_id' => '1' ), array( 'comment_ID' => '1', 'comment_post_ID' => '1', 'comment_author' => 'A WordPress Commenter', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'https =>//wordpress.org/', 'comment_author_IP' => '', 'comment_date' => '2021-01-02 13 =>03 =>52', 'comment_date_gmt' => '2021-01-02 13 =>03 =>52', 'comment_content' => 'Update, Hi, this is a comment.\r\nTo get started with moderating, editing, and deleting comments, please visit the Comments screen in the dashboard.\r\nCommenter avatars come from <a href=\'https =>//gravatar.com\' rel=\'nofollow ugc\'>Gravatar</a>.', 'comment_approved' => '1', 'comment_parent' => '0', 'comment_karma' => '0', 'comment_agent' => '', 'comment_type' => 'comment', 'user_id' => '0' ) ); $grouped = []; // $arr is your initial array array_walk($comments, function($v) use (&$grouped){ if (array_key_exists($v['comment_ID'], $grouped)) { $grouped[$v['comment_ID']]['comment_parent'][] = $v['comment_parent']; } else { $v['comment_parent'] = [$v['comment_parent']]; $grouped[$v['comment_ID']] = $v; } }); return $grouped;

Desired result: Each comment with the comment_id == comment_parent should nest inside.

I need to have comments { comment 1 { Reply to comment one { Reply to comment of comment one } } comment 2 { Reply to comment two { Reply to comment of comment two } } }

a reply simply has the same parent ID as the comment ID.

<?php $result = array( array( // Comments with key comment_post_ID value 1 or 2 ... level one '1' => array( // comments with key comment_parent value 1 for example next level '1' => array( array( // details inset. 'comment_ID' => '4', 'comment_author' => 'cc', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'http://localhost:10004', 'comment_author_IP' => '127.0.0.1', 'comment_date' => '2021-01-08 15 =>59 =>28', 'comment_date_gmt' => '2021-01-08 15 =>59 =>28', 'comment_content' => 'Surely I am the second level comment in queue.', 'comment_approved' => '1', 'comment_type' => 'comment', 'user_id' => '1' ), array( // details inset. 'comment_ID' => '3', 'comment_author' => 'cc', 'comment_author_email' => '[email protected]', 'comment_author_url' => 'http://localhost:10004', 'comment_author_IP' => '127.0.0.1', 'comment_date' => '2021-01-08 15 =>59 =>28', 'comment_date_gmt' => '2021-01-08 15 =>59 =>28', 'comment_content' => 'Surely I am the second level comment in queue.', 'comment_approved' => '1', 'comment_type' => 'comment', 'user_id' => '1' ), ) ) ) );
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  • Please, add a short example of the desired output Commented Jan 8, 2021 at 17:15
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    @syscall I have fixed the question. Commented Jan 8, 2021 at 17:31

1 Answer 1

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You could use a foreach and add to the $grouped array, using the keys [comment_post_ID] and [comment_parent] :

$comments = [ ['comment_ID' => '4', 'comment_post_ID' => '1', 'comment_parent' => '1', /*other data*/ ], ['comment_ID' => '3', 'comment_post_ID' => '1', 'comment_parent' => '2', /*other data*/ ], ['comment_ID' => '2', 'comment_post_ID' => '1', 'comment_parent' => '1', /*other data*/ ], ['comment_ID' => '1', 'comment_post_ID' => '1', 'comment_parent' => '0', /*other data*/ ], ]; $grouped = []; foreach ($comments as $comment) { // shortcuts for readability $post_id = $comment['comment_post_ID']; $parent_id = $comment['comment_parent']; // Comments with key comment_post_ID value 1 or 2 ... level one // the, comments with key comment_parent value 1 for example next level $grouped[$post_id][$parent_id][] = $comment; } print_r($grouped);

Output :

Array ( [1] => Array ( [1] => Array ( [0] => Array ( [comment_ID] => 4 [comment_post_ID] => 1 [comment_parent] => 1 ) [1] => Array ( [comment_ID] => 2 [comment_post_ID] => 1 [comment_parent] => 1 ) ) [2] => Array ( [0] => Array ( [comment_ID] => 3 [comment_post_ID] => 1 [comment_parent] => 2 ) ) [0] => Array ( [0] => Array ( [comment_ID] => 1 [comment_post_ID] => 1 [comment_parent] => 0 ) ) ) )

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2 Comments

Sorry for the late response. This works to nest the comments to the post_id as it should but doesn't not respect the levels deep. I have edited the question to make it better.
Desired result: Each comment with the comment_id == comment_parent should nest inside.

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