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Warning: Attempt to read property "post_type" on null in /www/wwwroot/wper.net/wp-content/plugins/wper-meta.php on line 363

Warning: Attempt to read property "post_type" on null in /www/wwwroot/wper.net/wp-content/plugins/wper-meta.php on line 363

前面我们讲述了利用 register_post_type 进行注册了自定义的文章（wordpress使用register_post_type 函数创建自定义文章类型）, 然后我们为这个自定义的文章添加了自定义的设置页面。要把菜单放在一个栏目中。如下图所示：

下面我们直接给出示例代码。

plugin.php 设置前后台使用不同的类

require_once JPOST_DIR . '/includes/class-wp-jpost.php';
new WP_JPost();

if ( is_admin() ) {
	require_once JPOST_DIR . '/includes/class-wp-jpost-settings.php';
	new JPostSettings();
}

WP_JPost 类

在 admin_menu 钩子中添加add_meta_box

 add_action( 'admin_menu', array( $this, 'add_meta_box' ) ); 

add_meta_box 里添加菜单

	public function add_meta_box() {
		add_menu_page( 'wp_jpost', 'wp-jpost', 'administrator', 'wp-jpost', '', '', 100);
		add_submenu_page('wp-jpost', __('Add New','wp-jpost'), __('Add New','wp-jpost'), 'administrator', 'post-new.php?post_type=wp-jpost', '' );

                // do something
	}

注册自定义文章

		register_post_type(
			$slug,
			array(
				'labels'              => $labels,
				'public'              => true,
				'exclude_from_search' => apply_filters( 'jposts_exclude_from_search', true ),
				'show_ui'             => true,
				'query_var'           => true,
				'menu_position'       => 999,
				'supports'            => $supports_array,
				'rewrite'             => array(
					'slug'       => $rewrite_slug,
					'with_front' => false,
				),
				'show_in_menu'	=>	'wp-jpost',
				'show_in_rest'        => true,
			)
		);

注意参数 show_in_menu 。这里设置显示的位置。

JPostSettings 类中创建设置菜单

    public function __construct(){
        add_action( 'admin_menu', array( $this, 'settings' ) );
    }

添加子菜单

    // Add Menu 
    public function settings(){
        add_submenu_page('wp-jpost', __('Settings','wp-jpost'), __('Settings','wp-jpost'), 'administrator', 'wp-jpost', array($this, 'create_admin_page'));
    }


    /**
     * Options page callback
     */
    public function create_admin_page(){
        // Set class property
        $this->options = get_option( '_jpost_setting' );
        settings_errors();//show settings messages.
        printf( '<div class="wrap"><h2>%s</h2><form method="post" action="options.php">',__('WP-JPost Settings','wp-jpost') );
        settings_fields( '_jpost_option_group' );
        do_settings_sections( '_jpost_settings' );
        submit_button();
        printf( '</form></div>' );
    }

到这里我们的菜单就建立完成了。