Online PHP editor | refs for eV2eM

<?php $array = [ [ 'u' => '30', 'v' => '16', 'w' => '22', 'x' => '30', 'y' => '16', 'z' => '22', ], [ 'u' => '32', 'v' => '25', 'w' => '1', 'x' => '30', 'y' => '16', 'z' => '22', ], [ 'u' => '30', 'v' => '16', 'w' => '22', 'x' => '54', 'y' => '96', 'z' => '2', ], [ 'u' => '30', 'v' => '16', 'w' => '22', 'x' => '3', 'y' => '1', 'z' => '6', ] ]; $result = []; foreach ($array as $row) { $key = vsprintf('%d_%d_%d', $row); if (!isset($ref[$key])){ $ref[$key] = $row; $result[] = &$ref[$key]; } else { $ref[$key]['x'] .= ',' . $row['x']; $ref[$key]['y'] .= ',' . $row['y']; $ref[$key]['z'] .= ',' . $row['z']; } } var_export($result);