Online PHP editor | refs for uuUTM

<?php $input = array( array('id' => 2, 'name' => 'Clement', 'upper' => 0), array('id' => 1, 'name' => 'Jean', 'upper' => 1), array('id' => 1, 'name' => 'Annie', 'upper' => 1), ); $map = array(); foreach ($input as $node) { // init self if (!array_key_exists($node['sn'], $map)) { $map[$node['sn']] = array('self' => $node['name']); } else { $map[$node['sn']]['self'] = $node['name']; } // init parent if (!array_key_exists($node['upper'], $map)) { $map[$node['upper']] = array(); } // add to parent $map[$node['upper']][$node['sn']] = & $map[$node['sn']]; } print_r($map[0]);