$tree = array( 1 => array( 'parent' => 0 ), 2 => array( 'parent' => 1 ), 3 => array( 'parent' => 1 ), 4 => array( 'parent' => 2 ) ); $newtree = array(); foreach($tree as $leaf) { if (!isset($newtree[$leaf['parent']])) $newtree[$leaf['parent']]=array(); $newtree[$leaf['parent']][]=$leaf; } <?php>print_r($newtree); </?>
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