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This article mainly shows you "how to use php to verify coordinates in a certain coordinate area", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use php to verify coordinates in a certain coordinate area" this article.

Previously encountered such a demand, to show the company's services in the map, and the user's daily access coordinates to see how many users are within the range of services that can be reached.

The following is the implementation of the PHP code (only verify that the coordinates are in a certain coordinate area)

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