Title Case Wordpress Menu Items

See if the following might work for you, I posted about it yesterday in response to another question so played around with it today. Also see the point in the codex of inheriting from Walker_Nav_Menu instead. You can subsequently modify the output of the menu and use your function.

Example from the codex:

<?php
class Walker_Quickstart_Menu extends Walker {

    // Tell Walker where to inherit it's parent and id values
    var $db_fields = array(
        'parent' => 'menu_item_parent', 
        'id'     => 'db_id' 
    );

    /**
     * At the start of each element, output a <li> and <a> tag structure.
     * 
     * Note: Menu objects include url and title properties, so we will use those.
     */
    function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
        $output .= sprintf( "\n<li><a href="https://wordpress.stackexchange.com/questions/259311/%s"%s>%s</a></li>\n",
            $item->url,
            ( $item->object_id === get_the_ID() ) ? ' class="current"' : '',
            $item->title
        );
    }

}

and

<ul>
    <?php
    wp_nav_menu(array(
        'menu'    => 2, //menu id
        'walker'  => new Walker_Quickstart_Menu() //use our custom walker
    ));
    ?>
</ul>

Reference: https://codex.wordpress.org/Class_Reference/Walker

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