xF1 Custom user field callback, validate value

[ven0m]

Heisenberg submitted a new resource:

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- For when you need special code to validate the value entered.

This is a skeleton for creating a callback for a custom user field. The callback is used to validate the value entered by the user. For example, if you are collecting some kind of ID that you need to check against another database.

The callback is specified when editing the custom field:

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The skeleton contains this file which matches the callback name:...

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