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<?php $arr=array( array('amount'=>100,'date'=>'2014-03-29'), array('amount'=>120,'date'=>'2014-03-30'), array('amount'=>200,'date'=>'2014-03-31') ); usort($arr, function($a, $b) { if($a['date'] == $b['date']) return 0; return $a['date'] > $b['date'] ? 1 : -1; }); $amount = 0; foreach($arr as &$item) { $amount += $item['amount']; $item['amount'] = $amount; } var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(2) { ["amount"]=> int(100) ["date"]=> string(10) "2014-03-29" } [1]=> array(2) { ["amount"]=> int(220) ["date"]=> string(10) "2014-03-30" } [2]=> &array(2) { ["amount"]=> int(420) ["date"]=> string(10) "2014-03-31" } }

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