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<?php $Todaysales = array( array("sale_time"=>"2017-09-10","payment_amount"=>1311.45), array("sale_time"=>"2017-09-10","payment_amount"=>1311.46), array("sale_time"=>"2017-09-10","payment_amount"=>175000.00), ); foreach($Todaysales as $d) { if(isset($data[$d['sale_time']])) $data[$d['sale_time']] += $d['payment_amount']; else $data[$d['sale_time']] = $d['payment_amount']; } print_r($data);