Replace Gravatar with UserPhoto in All Users Coulmn view

Not tested, but much probably this works:

Instead of trying to add/change the columns, change the get_avatar behavior.

For one, it is a pluggable function, so it can be overridden. And second, there are many Questions in this Stack on how to modify/customize the avatars.

Check this two:

In the first one, Bainternet states:

But the better part of User Photo plugin is that it has an overwrite function get_avatar which will get the user photo if exists or the gravatar if not.

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