微信公众平台开发（六）翻译功能开发_PHP教程

上一篇文章介绍了微信公众平台天气预报功能的开发，实现了微信公众平台的第一个实际应用，在接下来的这一篇文章中，我们将对微信翻译功能进行简单开发，以供读者参考。

二、思路分析

和上一篇查询天气的思路差不多，首先要对用户发送过来的消息进行判断，判断消息里是否含有“翻译”关键字，如果含有，则提取待翻译内容，然后调用网络上开放的翻译API 进行相关翻译。

网络上有很多翻译API，大家可以根据自己的需求进行选择。这里我们选择应用比较广泛的，翻译功能还比较不错的有道翻译API 和百度翻译API，下面对这两种API的相关信息进行分析。

3.1 有道翻译API

3.1.1 API 地址：http://fanyi.youdao.com/openapi

注意：有道提供的API 接口，在下面的测试时，json 数据格式返回不正确，到网上查阅资料，可以正确翻译的地址为 http://fanyi.youdao.com/fanyiapi，这点注意。

3.1.2 申请key

按照要求填写相关信息，这些信息，下面会使用到，所以请认真如实填写。

申请完之后，会在下方生成API key 和keyfrom，使用API 时会用到。

3.1.3 API 使用范例

3.1.4 数据格式

a. xml 格式

http://fanyi.youdao.com/openapi.do?keyfrom=orchid&key=1008797533&type=data&doctype=&version=1.1&q=这里是有道翻译API

<span <?<="" span=""><span xml="" version="1.0" encoding="UTF-8" <="" span=""><span ?=""></span>
<span <<="" span=""><span youdao-fanyi<="" span=""><span></span>
    <span <<="" span=""><span errorcode<="" span=""><span></span>0<span <="" span=""><span errorcode<="" span=""><span></span>
    <span <!--<="" span=""><span 有道翻译="" <="" span=""><span --=""></span>
    <span <<="" span=""><span query<="" span=""><span></span><span <![cdata[<="" span=""><span 这里是有道翻译api<="" span=""><span ]]=""></span><span <="" span=""><span query<="" span=""><span></span>
    <span <<="" span=""><span translation<="" span=""><span></span>
        <span <<="" span=""><span paragraph<="" span=""><span></span><span <![cdata[<="" span=""><span here="" is="" the="" youdao="" translation="" api<="" span=""><span ]]=""></span><span <="" span=""><span paragraph<="" span=""><span></span>
    <span <="" span=""><span translation<="" span=""><span></span>
<span <="" span=""><span youdao-fanyi<="" span=""><span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

http://fanyi.youdao.com/openapi.do?keyfrom=orchid&key=1008797533&type=data&doctype=&version=1.1&q=翻译

<span {="" "errorcode":0="" "query":"翻译",="" "translation":["translation"],="" 有道翻译="" "basic":{="" 有道词典-基本词典="" "phonetic":"fān="" yì",="" "explains":[="" "translate",="" "interpret"="" ]="" },="" "web":[="" 有道词典-网络释义="" "key":"翻译",="" "value":["translator","translation","translate","interpreter"]="" {...}="" }<="" span=""></span>

3.2 百度翻译API

3.2.1 API 地址：http://openapi.baidu.com/public/2.0/bmt/translate

3.2.2 获取api key

开发者在百度连接平台上注册得到的授权API key，详细请参阅：http://developer.baidu.com/wiki/index.php?title=%E5%B8%AE%E5%8A%A9%E6%96%87%E6%A1%A3%E9%A6%96%E9%A1%B5/%E7%BD%91%E7%AB%99%E6%8E%A5%E5%85%A5/%E5%85%A5%E9%97%A8%E6%8C%87%E5%8D%97

3.2.3 API 使用范例

百度翻译API 响应的数据格式为UTF-8编码的PHP数组对应的标准JSON字符串。

<span {="" “from”:”zh”,="" “to”:”en”,="" “trans_result”:[]="" }<="" span=""></span>

trans_result 为一个数组，其中每一个{}就是一个段落，结构如下所示：

<span trans_result:="" [="" {},="" {}="" ]<="" span=""></span>

段落结果即为trans_result 数组中的一项：

<span {="" “src”:””,="" “dst”:””="" }<="" span=""></span>

段落结果说明：

经json_decode 后的形式：

<span {="" "from":="" "en",="" "to":="" "zh",="" "trans_result":="" [="" "src":="" "today",="" "dst":="" "今天"="" }="" ]="" }<="" span=""></span>

翻译消息的格式是 “翻译+待翻译内容”，所以首先截取前两个字，判断是否为 “翻译” 关键字。

使用php函数 mb_substr() 截取，关于该函数的用法上一篇已经讲过，这里不再赘述。

从消息的开头开始截取，截取两个字符，然后加以判断是否为 “翻译” 关键字。

判断是否只输入“翻译”两字，这样输入，没有待翻译内容，则输入的消息也不正确。

接下来进行待翻译内容提取：

从消息的开头第3个字符开始截取，截取202个字符，截取出来的即为待翻译内容。

接着调用函数进行翻译。

<span <="" span=""><span 调用有道词典<="" span="">
<span $contentstr<="" span=""> = <span $this<="" span="">->youdaoDic(<span $word<="" span=""><span );="" <="" span=""><span <="" span=""><span 调用百度词典<="" span="">
<span $contentstr<="" span=""> = <span $this<="" span="">->baiduDic(<span $word<="" span="">);</span></span></span></span></span></span></span></span></span></span></span>

5.1 有道翻译API

数据接口：

http://fanyi.youdao.com/openapi.do?keyfrom=<span <<="" span=""><span keyfrom<="" span=""><span></span><span &key<="" span="">=<span <<="" span=""><span key<="" span=""><span></span><span &type<="" span="">=data<span &doctype<="" span="">=<span <<="" span=""><span doctype<="" span=""><span></span><span &version<="" span="">=1.1<span &q<="" span="">=要翻译的文本</span></span></span></span></span></span></span></span></span></span></span>

5.1.1 xml 格式

关键代码如下：

<span public<="" span=""> <span function<="" span=""> youdaoDic(<span $word<="" span=""><span ){="" <="" span=""><span $keyfrom<="" span=""> = "orchid";    <span <="" span=""><span 申请apikey="" 时所填表的网站名称的内容<="" span="">
        <span $apikey<="" span=""> = "YourApiKey";  <span <="" span=""><span 从有道申请的apikey="" 有道翻译-xml格式<="" span="">
        <span $url_youdao<="" span=""> = 'http://fanyi.youdao.com/fanyiapi.do?keyfrom='.<span $keyfrom<="" span="">.'&key='.<span $apikey<="" span="">.'&type=data&doctype=xml&version=1.1&q='.<span $word<="" span=""><span ;="" <="" span=""><span $xmlstyle<="" span=""> = <span simplexml_load_file<="" span="">(<span $url_youdao<="" span=""><span );="" <="" span=""><span $errorcode<="" span=""> = <span $xmlstyle<="" span="">-><span errorcode;="" <="" span=""><span $paras<="" span=""> = <span $xmlstyle<="" span="">->translation-><span paragraph;="" <="" span=""><span if<="" span="">(<span $errorcode<="" span=""> == 0<span ){="" <="" span=""><span return<="" span=""> <span $paras<="" span=""><span ;="" }<="" span=""><span else<="" span=""><span {="" <="" span=""><span return<="" span=""> "无法进行有效的翻译"<span ;="" }<br="">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

说明：

$xmlStyle = simplexml_load_file($url_youdao);　　// PHP 函数，将XML 文档载入对象中。

$errorCode = $xmlStyle->errorCode;　　// 获取错误码

$paras = $xmlStyle->translation->paragraph;　　// 获取翻译内容

5.1.2 json 格式

关键代码如下：

    <span public<="" span=""> <span function<="" span=""> youdaoDic(<span $word<="" span=""><span ){="" <="" span=""><span $keyfrom<="" span=""> = "orchid";    <span <="" span=""><span 申请apikey时所填表的网站名称的内容<="" span="">
        <span $apikey<="" span=""> = "YourApiKey";  <span <="" span=""><span 从有道申请的apikey="" 有道翻译-json格式<="" span="">
        <span $url_youdao<="" span=""> = 'http://fanyi.youdao.com/fanyiapi.do?keyfrom='.<span $keyfrom<="" span="">.'&key='.<span $apikey<="" span="">.'&type=data&doctype=json&version=1.1&q='.<span $word<="" span=""><span ;="" <="" span=""><span $jsonstyle<="" span=""> = <span file_get_contents<="" span="">(<span $url_youdao<="" span=""><span );="" <="" span=""><span $result<="" span=""> = json_decode(<span $jsonstyle<="" span="">,<span true<="" span=""><span );="" <="" span=""><span $errorcode<="" span=""> = <span $result<="" span="">['errorCode'<span ];="" <="" span=""><span $trans<="" span=""> = ''<span ;="" <="" span=""><span if<="" span="">(<span isset<="" span="">(<span $errorcode<="" span=""><span )){="" <="" span=""><span switch<="" span=""> (<span $errorcode<="" span=""><span ){="" <="" span=""><span case<="" span=""> 0:
                    <span $trans<="" span=""> = <span $result<="" span="">['translation']['0'<span ];="" <="" span=""><span break<="" span=""><span ;="" <="" span=""><span case<="" span=""> 20:
                    <span $trans<="" span=""> = '要翻译的文本过长'<span ;="" <="" span=""><span break<="" span=""><span ;="" <="" span=""><span case<="" span=""> 30:
                    <span $trans<="" span=""> = '无法进行有效的翻译'<span ;="" <="" span=""><span break<="" span=""><span ;="" <="" span=""><span case<="" span=""> 40:
                    <span $trans<="" span=""> = '不支持的语言类型'<span ;="" <="" span=""><span break<="" span=""><span ;="" <="" span=""><span case<="" span=""> 50:
                    <span $trans<="" span=""> = '无效的key'<span ;="" <="" span=""><span break<="" span=""><span ;="" <="" span=""><span default<="" span="">:
                    <span $trans<="" span=""> = '出现异常'<span ;="" <="" span=""><span break<="" span=""><span ;="" }="" <="" span=""><span return<="" span=""> <span $trans<="" span=""><span ;="" }<="" span=""></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

说明：

把整个文件读入一个字符串中

$result = json_decode($jsonStyle,true);　　// 对JSON 格式的字符串进行编码

$errorCode = $result['errorCode'];　　// 获取错误码

$trans = $result['translation']['0'];　　// 获取翻译结果

5.2 百度翻译API

百度翻译API提供UTF-8编码的PHP数组对应的标准JSON字符串，而且提供了 中->英，中->日，英->中，日->中 四种互译，比有道翻译多了一种。

关键代码如下：

    <span <="" span=""><span 百度翻译<="" span="">
    <span public<="" span=""> <span function<="" span=""> baiduDic(<span $word<="" span="">,<span $from<="" span="">="auto",<span $to<="" span="">="auto"<span ){="" <="" span=""><span <="" span=""><span 首先对要翻译的文字进行="" urlencode="" 处理<="" span="">
        <span $word_code<="" span="">=<span urlencode<="" span="">(<span $word<="" span=""><span );="" <="" span=""><span <="" span=""><span 注册的api="" key<="" span="">
        <span $appid<="" span="">="<span yourapikey<="" span="">"<span ;="" <="" span=""><span <="" span=""><span 生成翻译api的url="" get地址<="" span="">
        <span $baidu_url<="" span=""> = "http://openapi.baidu.com/public/2.0/bmt/translate?client_id=".<span $appid<="" span="">."&q=".<span $word_code<="" span="">."&from=".<span $from<="" span="">."&to=".<span $to<="" span=""><span ;="" <="" span=""><span $text<="" span="">=json_decode(<span $this<="" span="">->language_text(<span $baidu_url<="" span=""><span ));="" <="" span=""><span $text<="" span=""> = <span $text<="" span="">-><span trans_result;="" <="" span=""><span return<="" span=""> <span $text<="" span="">[0]-><span dst;="" }="" <="" span=""><span <="" span=""><span 百度翻译-获取目标url所打印的内容<="" span="">
    <span public<="" span=""> <span function<="" span=""> language_text(<span $url<="" span=""><span ){="" <="" span=""><span if<="" span="">(!<span function_exists<="" span="">('file_get_contents'<span )){="" <="" span=""><span $file_contents<="" span=""> = <span file_get_contents<="" span="">(<span $url<="" span=""><span );="" }<="" span=""><span else<="" span=""><span {="" <="" span=""><span <="" span=""><span 初始化一个curl对象<="" span="">
            <span $ch<="" span=""> =<span curl_init();="" <="" span=""><span $timeout<="" span=""> = 5<span ;="" <="" span=""><span <="" span=""><span 设置需要抓取的url<="" span="">
            curl_setopt (<span $ch<="" span="">, CURLOPT_URL, <span $url<="" span=""><span );="" <="" span=""><span <="" span=""><span 设置curl="" 参数，要求结果保存到字符串中还是<="" pre="">输出到屏幕上</span>
            curl_setopt (<span $ch<="" span="">, CURLOPT_RETURNTRANSFER, 1<span );="" <="" span=""><span <="" span=""><span 在发起连接前等待的时间，如果设置为0，则无限等待<="" span="">
            curl_setopt (<span $ch<="" span="">, CURLOPT_CONNECTTIMEOUT, <span $timeout<="" span=""><span );="" <="" span=""><span <="" span=""><span 运行curl，请求网页<="" span="">
            <span $file_contents<="" span=""> = curl_exec(<span $ch<="" span=""><span );="" <="" span=""><span <="" span=""><span 关闭url请求<="" span="">
            curl_close(<span $ch<="" span=""><span );="" }="" <="" span=""><span return<="" span=""> <span $file_contents<="" span=""><span ;="" }<="" span=""></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

说明：

baiduDic() 函数：

language_text($baidu_url));　　// 调用language_text() 函数获取目标URL所打印的内容，然后对JSON 格式的字符串进行编码

trans_result;　　//获取翻译结果数组

dst;　　//取第一个数组的dst 结果。

language_text() 函数：

有道翻译-xml 格式：

有道翻译-json 格式：

百度翻译：

注意：该翻译功能放在SAE上能够正常运行，但在BAE上运行不成功，各位有兴趣自行测试一下。

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