React Native Mobile 应用程序与后端的 Slim 框架 - 图片上传问题

如何解决React Native Mobile 应用程序与后端的 Slim 框架 - 图片上传问题

我们正在开发一个移动应用程序，我们需要将图像从相机和 galler 上传到我们使用 Alim API 的 php 服务器。但问题是我们从相机拍摄的图像是base64图像，并尝试上传但我们遇到了错误“file_get_contents（[object Object]）：无法打开流：没有这样的文件或目录”{{3 }}。

public function uploadFileTest($str){
        $response = array();
        //$encoded_string = base64_encode($str);
        $encoded_string = base64_encode(file_get_contents($str));
        //echo $encoded_string;
        $target_dir = '../profile/'; // add the specific path to save the file
        $decoded_file = base64_decode($encoded_string); // decode the file
        $mime_type = finfo_buffer(finfo_open(),$decoded_file,FILEINFO_MIME_TYPE); // extract mime type
        //echo $decoded_file;
        $extension = $this->mime2ext($mime_type); // extract extension from mime type
        //echo $extension;
        //$file = uniqid() .'.'. $extension; // rename file as a unique name
        $file = 'Test.'. $extension; // rename file as a unique name
        //$file_dir = $target_dir . uniqid() .'.'. $extension;
        $imageName = Date ( "YmdHis" )."_profile_dfds";
        $file_dir = $target_dir .(string)$imageName.'.'. $extension;
        $file_dir1 = 'Test.'. $extension;
        //echo "   ".$file_dir."   ". $decoded_file;
        try {
            file_put_contents($file_dir,$decoded_file); // save
            //database_saving($file);
            //header('Content-Type: application/json');
            //echo json_encode("File Uploaded Successfully");
        } catch (Exception $e) {
            header('Content-Type: application/json');
            echo json_encode($e->getMessage());
        }

        $response["img"] = $file_dir;
            
        return $response;
    }




    openCamera = async  () =>{
        var options = {
            title: 'Select Image',customButtons: [
              { 
                name: 'customOptionKey',title: 'Choose file from Custom Option' 
              },],storageOptions: {
              skipBackup: true,path: 'images',},};
        const granted = await PermissionsAndroid.request(
          PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,{
            title:"STC Permissions",message:"Stc need's to allow your camera Permissions",buttonNutral:"Ask me Latter",buttonPositive:"Yes",buttonNegative:"No"
          }
        );

        if(granted === PermissionsAndroid.RESULTS.GRANTED){
           
            ImagePicker.showImagePicker(options,res =>{
                this.setState({
                    camImage:res.uri
                })
            })
        }else{
          alert("Pleace try again");
        }
    }[enter image description here][2]

enter image description here：2 我需要有关如何解决此图片上传问题的指导，或者我的工作是否有任何替代解决方案。