【微信JSSDK】PHP版微信錄音文件下載

微信的錄音文件上傳到微信服務器上，只能保存三天。 所以須要作一個轉存到本身服務器，或者七牛雲的操做。

轉存到本身服務器

1. 調用微信JSSDK API 錄音， 錄音結束，上傳到微信服務器，獲取錄音文件的 media_id
2. 根據 media_id 下載錄音文件（amr）格式
3. 轉存到本身服務器（amr須要轉碼成mp3） 或者 七牛雲(有轉碼功能)

步驟1代碼

...
      /**
       * 開始錄音[省略了一部分代碼]
       */
      startRecord: function() {
        var that = this;
        if (!that._startRecordFlag) {
          typeof wx !== "undefined" && wx.startRecord({
            success: function(res) {
              Logger.log("res", res)
              if (res.errMsg == 'startRecord:ok') {
                Logger.log("正在開始錄音....")
                that._startTime = new Date().getTime();
              }
            }
          });
        }
      },

      /**
       * 結束錄音,並上傳
       */
      stopRecord: function() {
        that._startRecordFlag = false;
        typeof wx !== "undefined" && wx.stopRecord({
          
          success: function(res) {
            //上傳錄音
            wx.uploadVoice({
              localId: res.localId,
              isShowProgressTips: 1,
              success: function(resUpload) {
                //下載錄音文件到服務器，轉存起來
                Model.downloadRecordAudio(resUpload.serverId, function(result) {
                  console.log(resUpload.serverId, result.path)
                  that.attachment = result.path;
                  // that.attachment = resUpload.serverId;
                  that.stopRecordCallback && that.stopRecordCallback();
                })
              }
            });
          }
        });
      },
...

步驟2代碼

<?php
//處理方法，
upload();

//media_id爲微信jssdk接口上傳後返回的媒體id
function upload(){
    $media_id = $_POST["media_id"];
    $access_token = getAccessToken();
    
    $path = "./weixinrecord/";   //保存路徑，相對當前文件的路徑
    $outPath = "./php/weixinrecord/";  //輸出路徑，給show.php 文件用，上一級
    
    if(!is_dir($path)){
        mkdir($path);
    }
    
    //微 信上傳下載媒體文件
    $url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token={$access_token}&media_id={$media_id}";
    
    $filename = "wxupload_".time().rand(1111,9999).".amr";
    downAndSaveFile($url,$path."/".$filename);
    
    $data["path"] = $outPath.$filename;
    $data["msg"] = "download record audio success!";
    // $data["url"] = $url;
    
    echo json_encode($data);
}

//獲取Token
function getAccessToken() {
    //  access_token 應該全局存儲與更新，如下代碼以寫入到文件中作示例
    $data = json_decode(file_get_contents("./access_token.json"));
    if ($data->expire_time < time()) {
        $appid = "youappid";  //本身的appid
        $appsecret = "youappsecret";  //本身的appsecret
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$appid}&secret={$appsecret}";
        $res = json_decode(httpGet($url));
        $access_token = $res->access_token;
        if ($access_token) {
            $data->expire_time = time() + 7000;
            $data->access_token = $access_token;
            $fp = fopen("./access_token.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
        }
    }
    else {
        $access_token = $data->access_token;
    }
    return $access_token;
}

//HTTP get 請求
function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_URL, $url);
    
    $res = curl_exec($curl);
    curl_close($curl);
    
    return $res;
}

//根據URL地址，下載文件
function downAndSaveFile($url,$savePath){
    ob_start();
    readfile($url);
    $img  = ob_get_contents();
    ob_end_clean();
    $size = strlen($img);
    $fp = fopen($savePath, 'a');
    fwrite($fp, $img);
    fclose($fp);
}
?>

步驟3代碼【略】

目前沒有使用七牛雲，所以該部分代碼，參考七牛雲官網