menus

Can’t extend some core classes

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I am relatively new to wordpress development, I am trying to extend ‘Walker_Category_Checklist’ class found in /wp-admin/includes/class-walker-category-checklist.php to customize it for wp_terms_checklist() or wp_category_checklist() but when I try to require_once a link to my extended class in the child-theme function.php I get this error and site not loading!

Get post slug and match with menu item slug to change css

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I have a custom vertical menu based on posts of a specific category. I want to match the slug of the menu item with the slug of the current post to apply css. Specifically, I want to change the background of the selected menu item. Selected menu item means, when the user clicks the menu and page loads, the background of that menu item should be changed indicating the user is at this menu item/post. What I think, if the menu item consists of posts, then the slug of the posts and slug of the menu item should be same. In the html, each li tag has the menu item ID. The code I am is like this

dynamic php menu with hidden sub-categories only showing when the category name is clicked

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This is for a wordpress store and I want to show the categories names automatically, but with the sub-categories hidden, the code below works perfectly with the hover effect, now I wish to have the click effect instead. The $cats variable is to use the get_terms() function, but for here to work everywhere I had included a few categories, the categories only go so far as the “third generation”.