Question: Modify the example application of Section 10.2 to have it validate the zip code when it is entered, to ensure that it is a valid

Modify the example application of Section 10.2 to have it validate the zip code when it is entered, to ensure that it is a valid zip code for the given city and state. The response document can be a PHP script that looks up the zip code and the city and state in a small table of examples.

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