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Interpretation and explanation of register sidebar

First off, register_sidebar() is used to add a widget area, an area where you can add widgets to. And in short, esc_html__() retrieves and escapes the translation of a text, whereas those %1$s and %2$...
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How to make a user be able to register if such a login already exists?

First for the usernames, you already have the answer: you can’t make the usernames the same, while you can make the username hidden for the user during registration, and set automatically, for ...
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