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WordPress Custom Walker: Split menu based on item count
/* ==========================================================================
Custom Walker Menu
========================================================================== */
class mbt_split_nav_walker extends Walker_Nav_Menu {
var $current_menu = null;
var $break_point = null;
function start_el(&$output, $item, $depth, $args) {
global $wp_query;
// Get the locations of nav menus
$theme_locations = get_nav_menu_locations();
// Get the menu object of the current nav menu based on the returned theme location
$menu_obj = get_term( $theme_locations[$args->theme_location], 'nav_menu' );
if( !isset( $this->current_menu ) ) {
$this->current_menu = wp_get_nav_menu_object( $menu_obj->term_id );
}
if( !isset( $this->break_point ) ) {
$this->break_point = ceil( $this->current_menu->count / 2 ) + 1;
}
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
$class_names = ' class="' . esc_attr( $class_names ) . '"';
$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
$id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : '';
if( $this->break_point == $item->menu_order ) {
$output .= $indent . '</li></span></ul><ul class="nav top-nav cf right"><span><li' . $id . $value . $class_names .'>';
} else {
$output .= $indent . '<li' . $id . $value . $class_names . '>';
}
$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 ) .'"' : '';
$item_output = $args->before;
$item_output .= '<a'. $attributes .'>';
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
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