1, according to site visitors outside the network IP switch to visitors cities where they are located, and automatically save cookies value, is convenient for the next access speed! 2, IP data sina API, very accurate 3, need to refresh to see the city information, because the first visit need to set the cookies, can make the jump page to solve this problem. See 4, for the convenience of presentation, not made automatic switching, header (Location:) on the line

city.php
说明.htm

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