微信小程序wx.uploadfile本地文件转base64的实现代码

case 'imgBufferToBase64': 
 $data=''; 
 file_put_contents("1.txt",var_export($_FILES,true)."\r\n",FILE_APPEND); 
 if(!empty($_FILES['upload']['tmp_name'])){ 
  if(empty($_FILES['upload']['type'])){ 
   IO::Debug('文件类型不合法'); 
  } 
  if(!in_array($_FILES['upload']['type'],array( 
   'image/gif', 
   'image/pjpeg', 
   'image/jpeg', 
   'image/x-png', 
   'image/png', 
   'image/bmp' 
  ))){ 
   IO::Debug($_FILES['upload']['type'].'文件类型不合法'); 
  } 
  $data=file_get_contents($_FILES['upload']['tmp_name']); 
  file_put_contents("1.txt",var_export($data,true)."\r\n",FILE_APPEND); 
  IO::Debug('解析成功',true,$data); 
 } 
 IO::Debug("解析失败"); 
break; 

wx.uploadFile({ 
 url: 'https://' + app.globalData.host + '/api/?sign=' + sign, 
 filePath: tempFilePaths[0], 
 name: 'upload', 
 header: { 
 "content-type": "multipart/form-data", 
 "content-type": "application/x-www-form-urlencoded" 
 }, 
 formData: formData, 
 success: function (res) { 
 var $data = JSON.parse(res.data); 
  if (typeof ($data.data) != "undefined" && $data.code){ 
  var imgBase64 = "data:image/jpeg;base64," + $data.data; 
  } 
 } 
})