80行代码实现一个简易的wordpress仪表盘

wordpress的仪表盘很强大，能自己添加自己的小组件，也能删除小组件，但是却没有相关的添加一个仪表盘页面的相关函数和文档介绍，下面这几行代码，实现一个插件，在后台添加一个简易的仪表盘，还能拖动位置：

<?php
/*
Plugin Name: 测试添加仪表盘
*/
add_filter("kekc_dashboard_filter",function($wp_meta_boxes){
    $screen      = get_current_screen();
    global $wp_meta_boxes;
    $wp_meta_boxes[ $screen->id ][ "normal" ][ "core" ][ "test1" ] = array(
    		'id'       => "test1",
    		'title'    => "测试box1",
    		'callback' => function(){echo "测试111";},
    		'args'     => array("__widget_basename" => "测试卡片111",),
    );
    $wp_meta_boxes[ $screen->id ][ "normal" ][ "core" ][ "test2" ] = array(
    		'id'       => "test2",
    		'title'    => "测试box2",
    		'callback' => function(){echo "测试222";},
    		'args'     => array("__widget_basename" => "测试卡片222",),
    );
    return $wp_meta_boxes;
});
add_action( 'admin_menu', function(){
	add_menu_page(
		__( 'KEKC Dashboard', 'textdomain' ),//页面title
		'KEKC Dashboard',//菜单name
		'manage_options',//权限
		'kekc_dashboard',//页面id
		function(){
        	$screen      = get_current_screen();
        	$columns     = absint( $screen->get_columns() );
        	$columns_css = '';
        	if ( $columns ) {
        		$columns_css = " columns-$columns";
        	}
            wp_enqueue_script( 'dashboard' );
            if ( current_user_can( 'install_plugins' ) ) {
            	wp_enqueue_script( 'plugin-install' );
            	wp_enqueue_script( 'updates' );
            }
            if ( current_user_can( 'upload_files' ) ) {
            	wp_enqueue_script( 'media-upload' );
            }
            add_thickbox();
            if ( wp_is_mobile() ) {
            	wp_enqueue_script( 'jquery-touch-punch' );
            }
            global $wp_meta_boxes;
            $wp_meta_boxes = apply_filters("kekc_dashboard_filter",$wp_meta_boxes);
            ?>
            <div class="wrap">
            	<h1>KEKC Dashboard</h1>
            	<div id="dashboard-widgets-wrap">
            <div id="dashboard-widgets" class="metabox-holder<?php echo $columns_css; ?>">
            	<div id="postbox-container-1" class="postbox-container">
            	<!--<?php echo '<h2 style="margin-left:8px">标题</h2>';?>-->
            	<?php do_meta_boxes( $screen->id, 'normal', '' ); ?>
            	</div>
            	<div id="postbox-container-2" class="postbox-container">
            	<?php do_meta_boxes( $screen->id, 'side', '' ); ?>
            	</div>
            	<div id="postbox-container-3" class="postbox-container">
            	<?php do_meta_boxes( $screen->id, 'column3', '' ); ?>
            	</div>
            	<div id="postbox-container-4" class="postbox-container">
            	<?php do_meta_boxes( $screen->id, 'column4', '' ); ?>
            	</div>
            </div>
            	</div><!-- dashboard-widgets-wrap -->
            	<?php
            	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
            	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
            ?>
            </div><!-- wrap -->
            <?php
    		},
    		'dashicons-dashboard',
    		99
	);
} );