wordpress调用自定义菜单

　　wordpress要调用自定义菜单首先要注册菜单，将代码添加到主题文件夹下的function.php中，比如wordpress自带主题2019的定义如下

// This theme uses wp_nav_menu() in two locations.
		register_nav_menus(
			array(
				'menu-1' => __( 'Primary', 'twentynineteen' ),
				'footer' => __( 'Footer Menu', 'twentynineteen' ),
				'social' => __( 'Social Links Menu', 'twentynineteen' ),
			)
		);

　　这个表示导航栏的名称，左边是别名，右边是名称。别名会用在导航栏的调用上，名称则显示在菜单后台页面上

　　添加上述函数后，进入wp后台，在左侧菜单的“外观”里即多了“菜单”选项，primary，footer menu，social links menu就是可选的显示位置

　　在主题的header.php对应位置，引用导航栏。需要用到下面这个函数

<?php if ( has_nav_menu( 'menu-1' ) ) : ?>

<?php
wp_nav_menu( array $args = array(
    'menu'              => "", // (int|string|WP_Term) Desired menu. Accepts a menu ID, slug, name, or object.
    'menu_class'        => "", // (string) CSS class to use for the ul element which forms the menu. Default 'menu'.
    'menu_id'           => "", // (string) The ID that is applied to the ul element which forms the menu. Default is the menu slug, incremented.
    'container'         => "", // (string) Whether to wrap the ul, and what to wrap it with. Default 'div'.
    'container_class'   => "", // (string) Class that is applied to the container. Default 'menu-{menu slug}-container'.
    'container_id'      => "", // (string) The ID that is applied to the container.
    'fallback_cb'       => "", // (callable|bool) If the menu doesn't exists, a callback function will fire. Default is 'wp_page_menu'. Set to false for no fallback.
    'before'            => "", // (string) Text before the link markup.
    'after'             => "", // (string) Text after the link markup.
    'link_before'       => "", // (string) Text before the link text.
    'link_after'        => "", // (string) Text after the link text.
    'echo'              => "", // (bool) Whether to echo the menu or return it. Default true.
    'depth'             => "", // (int) How many levels of the hierarchy are to be included. 0 means all. Default 0.
    'walker'            => "", // (object) Instance of a custom walker class.
    'theme_location'    => "", // 指定显示的导航名，如果没有设置，则显示第一个（如果调用多个菜单这项一定要加）(string) Theme location to be used. Must be registered with register_nav_menu() in order to be selectable by the user.
    'items_wrap'        => "", // (string) How the list items should be wrapped. Default is a ul with an id and class. Uses printf() format with numbered placeholders.
    'item_spacing'      => "", // (string) Whether to preserve whitespace within the menu's HTML. Accepts 'preserve' or 'discard'. Default 'preserve'.
) );
?>

<?php endif; ?>

　　当然有些参数是可选的，可根据实际需要进行调用

　　2019主题的调用比较简单

<?php if ( has_nav_menu( 'menu-1' ) ) : ?>
                        <?php
                        wp_nav_menu(
                            array(
                                'menu_class'     => 'menu clearfix',
                                'items_wrap'     => '<ul id="%1$s" class="%2$s">%3$s</ul>',
                            )
                        );
                        ?>
                    <!-- #site-navigation -->
                <?php endif; ?>

　　更多详情可参考https://developer.wordpress.org/reference/functions/wp_nav_menu/

<?php if ( has_nav_menu( 'footer' ) ) : ?>
                        <?php
                        wp_nav_menu(
                            array(
                                'theme_location' => 'footer',//调用具体的位置菜单，否则默认显示第一个创建的菜单
                                'menu_class'     => '',
                                'items_wrap'     => '<ul id="%1$s" class="%2$s">%3$s</ul>',
                            )
                        );
                        ?>
                        <!-- #site-navigation -->
                    <?php endif; ?>

　　来个中文版的，更容易理解

<?php
$parameter = array(
'theme_location'  => '',//指定显示的导航名，如果没有设置，则显示第一个
'menu'            => 'header-menu',
'container'       => 'nav',//最外层容器标签名
'container_class' => 'primary',//最外层容器class名
'container_id'    => '',//最外层容器id值
'menu_class'      => 'sf-menu',//ul标签class
'menu_id'         => 'topnav',//ul标签id
'echo'            => true,//是否打印，默认是true，如果想将导航的代码作为赋值使用，可设置为false
'fallback_cb'     => 'wp_page_menu',//备用的导航菜单函数，用于没有在后台设置导航时调用
'before'          => '',//显示在导航a标签之前
'after'           => '',//显示在导航a标签之后
'link_before'     => '',//显示在导航链接名之后
'link_after'      => '',//显示在导航链接名之前
'items_wrap'      => '<ul id="%1$s">%3$s</ul>',
'depth'           => 0,//显示的菜单层数，默认0，0是显示所有层
'walker'          => ''//调用一个对象定义显示导航菜单
);
wp_nav_menu($parameter);
?>

相关文章：给 wp_nav_menu函数添加缓存提高页面效率