This is much simpler version of your question: Given a list of strings, how do I check the user input is in that list? You don’t need a special service or fancy software to do that, just make a big list of the zipcodes you support and use in_array. const $supported_zipcodes = [ ‘zipcode1…’, ‘zipcode2…’, … Read more
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You could always stored the selections in cookies or localStorage, then query the database via ajax calls on subsequent pages.
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