Can Timezone Determination Be Made Offline Using PHP?

Retrieving Timezone from Coordinates Locally

Determining the timezone of a specific location (latitude/longitude) often entails employing web services such as Geonames.org. However, for scenarios where stability is crucial, an offline approach is preferred. This question explores the possibility of achieving this in PHP.

Solution Using a Localized Database

To resolve this issue, it is recommended to leverage the following steps:

1. Obtain City Database: Acquire the comprehensive city database from Geonames.org.
2. Build a Compact List: Convert the downloaded database into a concise list that maps latitude and longitude coordinates to their corresponding timezones.
3. Utilize an R-Tree Implementation: Integrate an R-Tree implementation to efficiently search for the nearest city's timezone for a given coordinate.

This approach, as shared by the responder, enables rapid setup (less than a second) and supports thousands of lookups per second on an aging computer.

The above is the detailed content of Can Timezone Determination Be Made Offline Using PHP?. For more information, please follow other related articles on the PHP Chinese website!