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Using PHP’s listidentifiers (part of the DateTimeZone class ), we can create a dropdown menu of all available global timezone identifiers. It’s handy for inclusion in forms if you’re after a general region rather than just country.

The first function retrieves timezone values and returns an array:

The second function retrieves the timezone array and manufactures the select menu.

Usage is as follows:

The results is as follows:

Note: I’ve included raw HTML to show the list so timezone values may not be correct.

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