Add a login/logout link to the menu bar of any Genesis child theme

functions.php

<?php // add everything except for this opening line to your functions file

add_filter( 'wp_nav_menu_items', 'sp_add_loginout_link', 10, 2 );

function sp_add_loginout_link( $items, $args ) {
	// Change 'primary' to 'secondary' to put the login link in your secondary nav bar.
	if ( $args->theme_location != 'primary' ) {
		return $items;
	}
	
	if ( is_user_logged_in() ) {
		$items .= '<li class="menu-item"><a href="' . wp_logout_url( home_url() ) . '">Log Out</a></li>';
	} else {
		$items .= '<li class="menu-item"><a href="' . site_url( 'wp-login.php' ) . '">Log In</a></li>';
	}

	return $items;
}

Hey Nick! Thanks for the code snippet :-)

I ended up adding a redirect to my code so members were redirected to my member dashboard when logging in, and then the home page when logging out.

if ( is_user_logged_in() ) {
    $items = $items . '<li class="menu-item"><a href="'. wp_logout_url( home_url() ) .'">Log Out</a></li>';
} else {
    $items = $items . '<li class="menu-item"><a href="'. site_url('wp-login.php/?redirect_to='. home_url( '/member-dashboard/')) .'">Log In</a></li>';
}

I used home_url for the redirect, rather than site_url, as I have a sub folder going on in my set up.

I'm sure it could be extended to redirect to the permalink the member was on or to any of the other interesting places on my website!

Nice addition, @MissAmeliaSmith! Thanks for sharing it here.

Here's another way to do it wp_loginout https://codex.wordpress.org/Function_Reference/wp_loginout