/* Description: 获取利用豆瓣API根据ISBN取图书信息.Author: 老蟹License: GPL v2book对象利用方法:    $book = get_book_data($isbn);     $title = $book->getTitle();    if(!isset($title)) {        $message = "此书未找到.";    }else{        ....    }*/// 取Book信息function get_book_data($isbn) {    $url = "https://api.douban.com/v2/book/isbn/:".$isbn;            $curl = curl_init();    curl_setopt($curl, CURLOPT_URL, $url);    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);        $result = curl_exec($curl);    curl_close($curl);        $book_array = (array) json_decode($result, true);        if(!empty($book_array["title"])) {        $book_title = $book_array["title"];        $book_author = $book_array["authors"][0];        $book_cover = $book_array["image"];        $book_isbn = $book_array["isbn13"]; // ISBN13        $book_info = $book_array["summary"];                $book = new Book($book_title, $book_isbn, $book_author, $book_cover, $book_info);        return $book;    }    }    // 这里只取几个主要信息class Book {        private $book_title;    private $book_isbn;    private $author;    private $book_cover;    private $book_info;    public function __construct($book_title, $book_isbn, $author, $book_cover, $book_info) {        $this->author = $author;        $this->book_isbn = $book_isbn;        $this->book_cover = $book_cover;        $this->book_title = $book_title;        $this->book_info = $book_info;    }    public function getTitle() {        return $this->book_title;    }    public function getISBN() {        return $this->book_isbn;    }    public function getAuthor() {        return $this->author;    }    public function getCover() {        return $this->book_cover;    }        public function getBookInfo() {        return $this->book_info;        }    }