<?php $your_array = array(array("December 2012" => 58), array("December 2012" => 58) ); $res = array(); foreach($your_array as $val){ $res[key($val)][] = $val[key($val)]; } foreach($res as $k=>&$v){ $v = array_sum($v)/count($v); } echo "<pre>"; print_r($res);
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