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help....building dynamic list boxes

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I have just started to learn php and could use a little help. I have to list boxes. One that contains counties and the other contains cities. When the user selects a particular county, I want all cities in that county to show in the list box. The data on my table looks like this.

mycounty(J0) mycity1(J0)
mycounty2(J1) mycitys(J1)

you can see that there is a key at the end of the string that can tie them together. I am guessing I will need to create an array with the county and city. Is that the best way. hope this makes sense. Thanks.

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