Adding link for logged in user? [closed]

<?php 
if ( is_user_logged_in() ) {
    $current_user = wp_get_current_user();
    echo '<a class="btn" href="https://wordpress.stackexchange.com/author/" . 
        $current_user->display_name . 
        '">Channel</a>'; 
} else { 
    echo 'Welcome, visitor!'; 
} 
?>

Note that get_currentuserinfo() is deprecated in favour of wp_get_current_user().

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