Get username out of user ID

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In my Multisite Installation i get the user id with: 

$user_ID

and it works fine in my subsite (subdomain). My users can only log in from the mainsite and i didnt figure out how to get the username when the user is logged in and visits the subsite (subdomain) But the User ID works fine…

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I need the name of the user? Any way to filter the name out of the user ID – so i get the name of the user instead of the user id number?

Thank you so much

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  1. Try the get_user_by(...) Function, that returns a WP_User instance that you can then use to extract the User Name.

    <?php $user = get_user_by( $field, $value ); ?>

    So you would call it like so

    <?php $user = get_user_by( 'id', $user_ID ); ?>

    You can also try the wp_get_current_user function (click here ) that return details about the currently logged in user, including the full name.

    <?php global $current_user;
      wp_get_current_user();

      echo 'Username: ' . $current_user->user_login . "n";
      echo 'User email: ' . $current_user->user_email . "n";
      echo 'User first name: ' . $current_user->user_firstname . "n";
      echo 'User last name: ' . $current_user->user_lastname . "n";
      echo 'User display name: ' . $current_user->display_name . "n";
      echo 'User ID: ' . $current_user->ID . "n";
?>