My array is built in this format:

$my_array = array(
     1 => array('Pizza','9.99','New_York'),
     2 => array('Chicken Wok','12.49','New_Jersey'),
    ...
);

Then I fetch a database which contains meals.

How can I get the corresponding key of $my_array by knowing only the meal (e.g. my DB contains 'Chicken Wok' and I need to be able to get '2' as the key)?

Please note that I cannot change the structure of $my_array.