It seems that the OP have managed to solve his/her problem by doing this, which can be found at Different menus for logged-in users.
if ( is_user_logged_in() ) {
wp_nav_menu( array( 'theme_location' => 'logged-in-menu' ) );
} else {
wp_nav_menu( array( 'theme_location' => 'logged-out-menu' ) );
}
The more shorter way to achieve that is by doing this, which is posted in new developer.wordpress.org version:
wp_nav_menu( array(
'theme_location' => is_user_logged_in() ? 'logged-in-menu' : 'logged-out-menu'
) );
The robust way to achieve that without creating two different menus, is to use a custom 'walker' function:
Look for the custom walker class that your theme is using in its wp_nav_menu():
wp_nav_menu( array(
// More arguments here..
'walker' => new Your_Theme_Custom_Nav_Walker(),
) );
Write a new class in your "functions.php", extend Your_Theme_Custom_Nav_Walker class (you can easily search its declaration by using an IDE) or extend the Walker_Nav_Menu class if they're not using any custom walker, and copy the necessary function(s) to modify, mostly the start_el() function, of that walker class in their declaration. Here is the simple custom class that extends the Walker_Nav_Menu that I build to suit your needs:
class WP_Custom_Nav_Walker extends Walker_Nav_Menu {
/**
* Start the element output.
*
* @see Walker::start_el()
*
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu()
* @param int $id Current item ID.
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
/**
* Filter the CSS class(es) applied to a menu item's list item element.
*
* @since 3.0.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $classes The CSS classes that are applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
/**
* Filter the ID applied to a menu item's list item element.
*
* @since 3.0.1
* @since 4.1.0 The `$depth` parameter was added.
*
* @param string $menu_id The ID that is applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args, $depth );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
// MODIFICATION STARTS HERE!!
$output .= $indent . '<li' . $id . $class_names;
if (apply_filters('the_title', $item->title, $item->ID) === 'My Account') {
if ( is_user_logged_in() ) {
$output .= '>';
} else {
$output .= '><a href="' . get_site_url() . '/wp-login.php">Log in</a></li>';
$output .= '<li style="display: none">';
}
} else {
$output .= '>';
}
// MODIFICATION ENDS HERE!!
$atts = array();
$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
/**
* Filter the HTML attributes applied to a menu item's anchor element.
*
* @since 3.6.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $atts {
* The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
*
* @type string $title Title attribute.
* @type string $target Target attribute.
* @type string $rel The rel attribute.
* @type string $href The href attribute.
* }
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$item_output = $args->before;
$item_output .= '<a'. $attributes .'>';
/** This filter is documented in wp-includes/post-template.php */
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= '</a>';
$item_output .= $args->after;
/**
* Filter a menu item's starting output.
*
* The menu item's starting output only includes `$args->before`, the opening `<a>`,
* the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
* no filter for modifying the opening and closing `<li>` for a menu item.
*
* @since 3.0.0
*
* @param string $item_output The menu item's starting HTML output.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of {@see wp_nav_menu()} arguments.
*/
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
You can use that WP_Custom_Nav_Walker like this:
wp_nav_menu( array(
// More arguments here..
'walker' => new WP_Custom_Nav_Walker(),
) );
You can check this answer for another example how to do that.
wp_nav_menu()? Can you provide its arguments and the HTML source of your navbar?