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wp_login

Checks a users login information and logs them in if it checks out. This function is deprecated.

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wp_get_cookie_login

Gets the user cookie login. This function is deprecated.

wp_clearcookie

Clears the authentication cookie, logging the user out. This function is deprecated.

wp_setcookie

Sets a cookie for a user who just logged in. This function is deprecated.

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get_currentuserinfo

Populate global variables with information about the currently logged in user.

set_current_user

Changes the current user by ID or name.