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<?php $ar = [ "vasteras"=> [ [ "2017-06-02", "2017-06-12" ], [ "2017-04-01", "2017-04-08", "2017-04-15", ] ] ] ; $result = null; function get($array, $date){ foreach ($array as $item){ if(in_array($date, $item)){ return $item; } } } var_dump(get($ar['vasteras'],"2017-04-01"));

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