PHP BookCatalog::add_tags示例

<?php

require_once 'inc/config.inc.php';
require_once 'lib/book_catalog.lib.php';
require 'inc/admin_auth.inc.php';
require 'inc/header.inc.php';
$catalog = new BookCatalog();
$action = $_POST['action'];
if (isset($action)) {
    echo '<div class="content result">';
    switch ($action) {
        case 'add':
            $tags = $_POST['tags'];
            $tags = explode(' ', $tags);
            $result = $catalog->add_tags($tags);
            echo "{$result} tags added";
            break;
        case 'delete':
            $tags = $_POST['tags'];
            $result = $catalog->delete_tags($tags);
            echo "{$result} tags deleted";
            break;
        case 'tag':
            $aliases = $_POST['aliases'];
            $tags = $_POST['tags'];
            $result = $catalog->tag_books($aliases, $tags);
            echo "{$result} tags applied";
            break;
        case 'untag':
            $aliases = $_POST['aliases'];
            $tags = $_POST['tags'];