customization - Fatal error with start_lvl and start_el in an abandoned theme

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I have been unable to resolve this problem even after reading many related posts. This problem begun after updating to PHP 8. It concerns a theme that I bought many years ago and that has been abandoned by his author. I'm planning to migrate to a new theme but this is going to take time and I need to temporarily reconnect the site.

This seems to be a classic disfunction around the parameters used in functions start_lvl and start_el when they are not compatible with Walker_Nav_Menu parameters.

After reading many answers on the forum, in the theme's code, I replaced function start_lvl( &$output, $depth ) by function start_lvl( &$output, $depth = 0, $args = array() ) and also function start_el( &$output, $item, $depth, $args ) by function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) but then I got a new fatal error pointing to the core

Fatal error: Uncaught ArgumentCountError: Too few arguments to function WP_Widget::__construct() etc...

After reading on the forum about this new alert, I understood that I have to fix the problem on the theme, and must probably, on the parameters used to extend walker menu.

I will appreciate if someone there can help me to understand what is happening and how can I solve this situation. You can find here the original code used on the theme to extend Walker Menu :

<?php
class arctic_walker_menu extends Walker_Nav_Menu {

// add classes to ul sub-menus
    function start_lvl( &$output, $depth ) {
        // depth dependent classes
        $indent = ( $depth > 0  ? str_repeat( "\t", $depth ) : '' ); // code indent
        $display_depth = ( $depth + 1); // because it counts the first submenu as 0
        $classes = array(
            'sub-menu',
            ( $display_depth % 2  ? 'menu-odd' : 'menu-even' ),
            ( $display_depth >=2 ? 'sub-sub-menu' : '' ),
            'menu-depth-' . $display_depth
        );
        $class_names = implode( ' ', $classes );

        // build html
        $output .= "\n" . $indent . '<ul class="' . $class_names . '">' . "\n";
    }

    function start_el( &$output, $item, $depth, $args ) {
        global $wp_query;
        $indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent

        // depth dependent classes
        $depth_classes = array(
            ( $depth == 0 ? 'main-menu-item' : 'sub-menu-item' ),
            ( $depth >=2 ? 'sub-sub-menu-item' : '' ),
            ( $depth % 2 ? 'menu-item-odd' : 'menu-item-even' ),
            'menu-item-depth-' . $depth
        );
        $depth_class_names = esc_attr( implode( ' ', $depth_classes ) );

        // passed classes
        $classes = empty( $item->classes ) ? array() : (array) $item->classes;
        $class_names = esc_attr( implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ) );

        // build html
        $output .= $indent . '<li id="nav-menu-item-'. $item->ID . '" class="' . $depth_class_names . ' ' . $class_names . '">';

        // link attributes
        $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
        $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
        $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
        $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
        $attributes .= ' class="menu-link ' . ( $depth > 0 ? 'sub-menu-link' : 'main-menu-link' ) . '"';

        $item_output = sprintf( '%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s',
            $args->before,
            $attributes,
            $args->link_before,
            apply_filters( 'the_title', $item->title, $item->ID ),
            $args->link_after,
            $args->after
        );

        // build html
        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
    }
}

Regards, Guillermo

本文标签： customizationFatal error with startlvl and startel in an abandoned theme