strcasecmp($a['name'], $b['name'])); // Sort children by name within each group foreach ($children as &$group) { usort($group, fn($a, $b) => strcasecmp($a['name'], $b['name'])); } unset($group); // Build ordered list: parent -> its children -> next parent... $sorted = []; foreach ($parents as $p) { $sorted[] = $p; if (isset($children[$p['id']])) { foreach ($children[$p['id']] as $c) { $sorted[] = $c; } } } // Orphan children (parent not in list) foreach ($children as $pid => $group) { if (!isset($parents[$pid])) { foreach ($group as $c) { $sorted[] = $c; } } } ?>

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