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/**
 * Display the Log In/Out link.
 *
 * Displays a link, which allows users to navigate to the Log In page to log in
 * or log out depending on whether they are currently logged in.
 *
 * @since 1.5.0
 * @uses apply_filters() Calls 'loginout' hook on HTML link content.
 *
 * @param string $redirect Optional path to redirect to on login/logout.
 * @param boolean $echo Default to echo and not return the link.
 */
function wp_loginout($redirect = '', $echo = true) {
    if ( ! is_user_logged_in() )
        $link = '<a href="' . esc_url( wp_login_url($redirect) ) . '">' . __('Log in') . '</a>';
    else
        $link = '<a href="' . esc_url( wp_logout_url($redirect) ) . '">' . __('Log out') . '</a>';


    if ( $echo )
        echo apply_filters('loginout', $link);
    else
        return apply_filters('loginout', $link);
}


/**
 * Returns the Log Out URL.
 *
 * Returns the URL that allows the user to log out of the site
 *
 * @since 2.7.0
 * @uses wp_nonce_url() To protect against CSRF
 * @uses site_url() To generate the log in URL
 * @uses apply_filters() calls 'logout_url' hook on final logout url
 *
 * @param string $redirect Path to redirect to on logout.
 */
function wp_logout_url($redirect = '') {
    $args = array( 'action' => 'logout' );
    if ( !empty($redirect) ) {
        $args['redirect_to'] = urlencode( $redirect );
    }


    $logout_url = add_query_arg($args, site_url('wp-login.php', 'login'));
    $logout_url = wp_nonce_url( $logout_url, 'log-out' );


    return apply_filters('logout_url', $logout_url, $redirect);
}