<view class="main"> 
<image src='{{source}}'/>
<button bindtap="uploadimg">拍照或上传图片</button> 
</view> 

Page({
  data:{
    source:"",
  },
  // 上传图片
  uploadimg:function(){
    var that = this;
    // 从本地相册选择图片或者使用相机拍照
    wx.chooseImage({
      count: 1,
      sizeType:['original', 'compressed'] ,
      sourceType:['album', 'camera'],
      success:function(res){
        console.log("选择图片相应"+res);
        that.setData({
          source:res.tempFilePaths,
        });
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片 
        var tempFilePaths = res.tempFilePaths; 
        wx.uploadFile({ 
          url: 'https://www.yyl.plus/PestIdentify/api/', 
          filePath: tempFilePaths[0], 
          name: 'file', 
          success:function(res){ 
            //打印
            console.log("响应数据：");
            console.log(res.data);
          },
        })
      }
    })
  }
})

<?php 
// 上传图片 
function uploadimg() { 
    $file = $_FILES['file'];
    // $file = request()->file('file');
    if ($file) { 
        //var_dump($file);
        // 获取文件后缀名
        $ext = pathinfo($file['name'], PATHINFO_EXTENSION);
        $target = '../public/upload/weixin/' . uniqid() . '.' . $ext;
        // 转移图片地址
        if (!move_uploaded_file($file['tmp_name'], $target)) {
            $GLOBALS['error_message'] = '上传图片失败';
            echo error_message;
        }
        $res = [
            'errCode'=>0,
            'error_message'=>'图片上传成功',
            'file'=>$target
        ];
        $data = json_encode($res);
        var_dump($data);  
    }
}
uploadimg();