FLaten a multidimension array with associative array as values

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PHP

i have this array and would like to get the values and keysin a flat array please help,
Array ( [0] => Array ( [DT] => 4 [NO_Calls] => 300 [Agents] => 8001 ) [1] => Array ( [DT] => 4 [NO_Calls] => 6000 [Agents] => 8002 ) )

this is the code for mysql

public function selectJ($query) {
    $rows = array();
            $result = $this -> db_query($query);

            if($result === false) {
                    return false;
            }

            while ($row = mysqli_fetch_assoc( $result)) {
                    $rows[] = $row;
            }
        return $rows;
        }

i would like it to be something like this

Array ( [DT] => 4 [NO_Calls] => 300 [Agents] => 8001 [DT] => 4 [NO_Calls] => 6000 [Agents] => 8002 )