Online PHP editor | refs for H0RHT

<?php $a = array ( '2014-04-22|Paul' => 0, '2014-04-28|Paul' => 2, '2014-05-13|Paul' => 0, '2014-06-03|Paul' => 1, '2014-06-12|Paul' => 0, '2014-08-11|Paul' => 1, '2014-08-28|Paul' => 3, '2012-05-09|John' => 1, '2012-08-29|John' => 2, '2012-09-05|John' => 0, '2012-09-13|John' => 1 ); $b = array(); $lastname = ''; foreach ($a as $key => $value) { list($d, $n) = explode('|', $key); if ($n == $lastname) { $total += $value; } else { $total = $value; } $b[$key] = $total; $lastname = $n; } print_r($b);