WordPress: Nav menu hacks

override_link_attributes.php

<?php
/**
 * Add custom attributes to WP nav menu links
 */
	add_filter( 'nav_menu_link_attributes', 'nav_menu_link_attributes_override', 10, 3 );
	function nav_menu_link_attributes_override( $atts, $item, $args ) {

		// Use an identifier like a hashtag to grab the ones you want to override
		if ( 'custom' === $item->type && ( preg_match( '/^#/', $item->url ) ) ) {

			// Get value after the hashtag
			$value = substr( $item->url, 1 );
			// Do something with it

			// You can also search for a specific value and replace it with something else
			$search_and_replace = array(
				'#logout' => wp_logout_url()
			);

			foreach ( $search_and_replace as $search => $replace ) {
				if ( $atts[ 'href' ] === $search ) {
					$atts[ 'href' ] = str_replace( $search, $replace, $atts[ 'href' ] );
					break;
				}
			}
		}

		return $atts;
	}
}

override_link_title.php

<?php
/**
 * Search and replace titles from WP nav menu links
 */
	add_filter( 'nav_menu_item_title', 'nav_menu_item_title_override', 10, 3 );
	function nav_menu_item_title_override( $title ) {
		$search = '{{ keyword }}';
		if ( false !== strpos( $title, $search ) ) {
			$replace = 'Replace keyword with this';
			$title = str_replace( $search, $replace, $title );
		}
		return $title;
	}
}