WordPress 后台直接复制文章并设置状态为草稿

    // 复制文章

    function zm_clone_post_as_draft() {

    	global $wpdb;

    	if (! ( isset( $_GET['post']) || isset( $_POST['post'])  || ( isset($_REQUEST['action']) && 'zm_clone_post_as_draft' == $_REQUEST['action'] ) ) ) {

    		wp_die('No post to clone has been supplied!');

    	}

    	//  Nonce 验证

    	if ( !isset( $_GET['clone_nonce'] ) || !wp_verify_nonce( $_GET['clone_nonce'], basename( __FILE__ ) ) )

    	return;

    	// 获取原文章ID

    	$post_id = (isset($_GET['post']) ? absint( $_GET['post'] ) : absint( $_POST['post'] ) );

    	// 所有文章数据

    	$post = get_post( $post_id );

    	// 如果不希望当前用户作为新文章作者，将下两行替换为$new_post_author = $post->post_author;

    	$current_user = wp_get_current_user();

    	$new_post_author = $current_user->ID;

    	// 如果发布数据存在，则创建发布克隆

    	if (isset( $post ) && $post != null) {

    	// 创建新文章数组

    		$args = array(

    			'comment_status' => $post->comment_status,

    			'ping_status'    => $post->ping_status,

    			'post_author'    => $new_post_author,

    			'post_content'   => $post->post_content,

    			'post_excerpt'   => $post->post_excerpt,

    			'post_name'      => $post->post_name,

    			'post_parent'    => $post->post_parent,

    			'post_password'  => $post->post_password,

    			'post_status'    => 'draft',

    			'post_title'     => $post->post_title,

    			'post_type'      => $post->post_type,

    			'to_ping'        => $post->to_ping,

    			'menu_order'     => $post->menu_order

    		);

    		// 通过wp_insert_post() 函数添加文章

    		$new_post_id = wp_insert_post( $args );

    		// 将新的文章设置为草稿

    		$taxonomies = get_object_taxonomies($post->post_type); // 返回文章类型的分类数组，例如：array("category", "post_tag");

    		foreach ($taxonomies as $taxonomy) {

    			$post_terms = wp_get_object_terms($post_id, $taxonomy, array('fields' => 'slugs'));

    			wp_set_object_terms($new_post_id, $post_terms, $taxonomy, false);

    		}

    		// 查询复制所有文章信息 post meta

    		$post_meta_infos = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id=$post_id");

    		if (count($post_meta_infos)!=0) {

    			$sql_query = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) ";

    			foreach ($post_meta_infos as $meta_info) {

    				$meta_key = $meta_info->meta_key;

    				if( $meta_key == '_wp_old_slug' ) continue;

    				$meta_value = addslashes($meta_info->meta_value);

    				$sql_query_sel[]= "SELECT $new_post_id, '$meta_key', '$meta_value'";

    			}

    			$sql_query.= implode(" UNION ALL ", $sql_query_sel);

    			$wpdb->query($sql_query);

    		}

    		wp_redirect( admin_url( 'edit.php?post_type='.$post->post_type ) );

    		exit;

    	} else {

    		wp_die('Post creation failed, could not find original post: ' . $post_id);

    	}

    }

    add_action( 'admin_action_zm_clone_post_as_draft', 'zm_clone_post_as_draft' );

    // 复制文章并添加到列表

    function zm_clone_post_link( $actions, $post ) {

    	if (current_user_can('edit_posts')) {

    		$actions['clone'] = '<a href="' . wp_nonce_url('admin.php?action=zm_clone_post_as_draft&post=' . $post->ID, basename(__FILE__), 'clone_nonce' ) . '" title="Clone this '.$post->post_type.'" rel="permalink">复制</a>';

    	}

    	return $actions;

    }

    add_filter( 'post_row_actions', 'zm_clone_post_link', 10, 2 );

    add_filter('page_row_actions', 'zm_clone_post_link', 10, 2);