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<?php $array = [ ['quantity' => 5, 'dd' => '01-Nov-2012'], ['quantity' => 10, 'dd' => '01-Nov-2012'], ['quantity' => 3, 'dd' => '02-Nov-2012'], ['quantity' => 4, 'dd' => '03-Nov-2012'], ['quantity' => 15, 'dd' => '03-Nov-2012'], ]; var_export( array_values( array_reduce( $array, function($result, $row) { if (!isset($result[$row['dd']])) { $result[$row['dd']] = $row; } else { $result[$row['dd']]['quantity'] += $row['quantity']; } return $result; } ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'quantity' => 15, 'dd' => '01-Nov-2012', ), 1 => array ( 'quantity' => 3, 'dd' => '02-Nov-2012', ), 2 => array ( 'quantity' => 19, 'dd' => '03-Nov-2012', ), )

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