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<?php $comments = [ 1 => ['content' => "The first comment", 'parent' => 0], 2 => ['content' => "The second comment", 'parent' => 0], 3 => ['content' => "Reply of first comment", 'parent' => 1], 4 => ['content' => "Another reply of first comemnt", 'parent' => 1], 5 => ['content' => "Reply of a reply of the first comment", 'parent' => 4] ]; foreach($comments as $id => &$c) { if (isset($comments[$c['parent']])) { $comments[$c['parent']]['comments'][$id] =& $c; unset($comments[$id]); } } var_dump($comments);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [1]=> array(3) { ["content"]=> string(17) "The first comment" ["parent"]=> int(0) ["comments"]=> array(2) { [3]=> array(2) { ["content"]=> string(22) "Reply of first comment" ["parent"]=> int(1) } [4]=> array(2) { ["content"]=> string(30) "Another reply of first comemnt" ["parent"]=> int(1) } } } [2]=> array(2) { ["content"]=> string(18) "The second comment" ["parent"]=> int(0) } [5]=> &array(2) { ["content"]=> string(37) "Reply of a reply of the first comment" ["parent"]=> int(4) } }

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