你如何回应in_array结果？

I am trying to each out the matching airport code value. I.e. if it matches HKG, it will echo Hong Kong.

$city  = array (
            'HKG'=>'Hong Kong',
            'SIN'=>'Singapore',
            'TPE'=>'Taipei',
            'HND'=>'Tokyo',
            'MDW'=>'Chicago',
         );

if(in_array($city, $row->city)){
    echo 
}

Why not just use

echo $city[$row->city];

If you are getting result, just use

echo $row->city;