php实现豆瓣isbn查询API接口制作

引言
因为最近要做一个扫描图书的ISBN编码获取图书信息的功能，要用到一个开放的API，首先想到的就是豆瓣。但是豆瓣由于什么原因关闭了开放的API。

一.实现效果
图片描述

二.代码实现
1.首先分析豆瓣图书首页查询ISBN编码的方法。地址https://book.douban.com/。

2.分析豆瓣的界面结构以及自己需要抓取的信息。

3.利用php进行重定向和curl,取出关键的内容。

（注意：本套代码采用的TP5.1编写）详细代码：

 public function getBookInfo(){
        $isbn = @$_GET['isbn'];
        $surl = 'https://book.douban.com/isbn/' . $isbn . '/';
        $headers = json_encode(get_headers($surl), true);
        $headers = json_encode($headers, true);
        $surl = cut($headers, 'Location: ', '"');
        $surl = str_replace('\\', '', $surl);//302地址
        $data = getIsbn($surl);
        $data_1 = cut($data, 'application/ld+json">', '');
        $data_1 = json_decode($data_1, true);
        $res['title'] = $data_1['name'];//书名
        $res['logo'] = cut($data, 'data-pic="', '"');//图标
        $author = $data_1['author'];
        if ($author[0] == '') {
            $author[0]['name'] = '未知';
        }
        $res['author'] = $author;//作者
        //相关书籍推荐
        $publisher = cut($data, '出版社:', '
');
        if ($publisher == '') {
            $publisher = '未知';
        }
        $author_desc = cut($data, 'class="indent ">', '

'); $res['author_desc'] = cut($author_desc, '

', '

');//作者简介 $res['publisher'] = $publisher;//出版社 $published = cut($data, '出版年:', '
'); if ($published == '') { $published = '未知'; } $res['published'] = $published;//出版年 $page = cut($data, '页数:', '
'); if ($page == '') { $page = '未知'; } $res['page'] = $page;//页数 $price = cut($data, '定价:', '
'); if ($price == '') { $price = '未知'; } $res['price'] = $price;//定价 $designed = cut($data, '装帧:', '
'); if ($designed == '') { $designed = '未知'; } $res['designed'] = $designed;//装帧 $description = cut($data, 'class="intro">', '

'); $description = explode('

', $description)[1]; if ($description == '') { $description = '未知'; } $res['description'] = $description;//简介 return show(1,'请求成功',$res); }

common.php中实现cut（）方法、getIsbn（）和show（）方法。

function cut($content, $start, $end)
{
    $r = explode($start, $content);
    if (isset($r[1])) {
        $r = explode($end, $r[1]);
        return $r[0];
    }
    return '';
}

function getIsbn($url) //curl get请求
{
    $postUrl = $url;
    $curlPost = 'GET';
    $curl = curl_init();//初始化curl
    curl_setopt($curl, CURLOPT_URL,$postUrl);//抓取指定网页
    curl_setopt($curl, CURLOPT_HEADER, 0);//设置header
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
    curl_setopt($curl, CURLOPT_POST, 1);//post提交方式
    curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); //不验证证书下同
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($curl);//运行curl
    curl_close($curl);
    return $data;
}

function show($status, $message, $data = [])
{
    $data = [
        'status' => $status,
        'message' => $message,
        'data' => $data
    ];
    return json_encode($data, JSON_UNESCAPED_UNICODE);
}