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<?php // Everything you enter here will be executed by our servers. Try it! $wineBuys = array ( '2013-09-12' => 20, '2013-09-13' => 10, '2013-09-14' => 49 ); $hamBuys = array ( '2013-09-12' => 1, '2013-09-13' => 16, '2013-09-14' => 2 ); $cheeseBuys = array ( '2013-09-12' => 5, '2013-09-13' => 6, '2013-09-14' => 12 ); $calcByDate = array(); foreach ($wineBuys as $key => $value) { if (! array_key_exists($key, $calcByDate)) { $calcByDate[$key] = array($wineBuys[$key]); } else { $calcByDate[$key][] = $wineBuys[$key]; } }
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