torounit · October 22, 2015 04:17
diff --git a/functions.php b/functions.php
 <?php
 add_filter( 'nav_menu_css_class', function ( $classes, $item, $args ) {
 	if ( ! empty( $args->li_class ) ) {
 		$classes[] = $args->li_class;
 	}

 	return $classes;
 }, 10, 3 );
diff --git a/use.php b/use.php
 <?php 
 wp_nav_menu( [
  'theme_location' => 'primary',
  'li_class' => 'p-navigation__item',
 ] );
 ?>
	<?php
	add_filter( 'nav_menu_css_class', function ( $classes, $item, $args ) {
	if ( ! empty( $args->li_class ) ) {
	$classes[] = $args->li_class;
	}

	return $classes;
	}, 10, 3 );