CodeIgniter force_download 未下载文件，而是将垃圾字符打印到控制台

Question

我正在尝试从我的数据库中提取数据，写入 CSV 文件，压缩这些 CSV 文件，然后下载 zip。

我可以毫不费力地将文件写入服务器，当我手动下载它们时它们看起来很好，但是当我调用 force_download 时没有任何反应并且 ajax 调用在响应。

这是我的控制器代码：

    public function ajax_getDataSubset() {
        if (!$this->input->post()){
            echo json_encode(array('status'=>'failed','errors'=>array('Access Mode'=>'Disallowed')));
            exit();
        }
      
        $options = $this->input->post();       
            if (isset($options['state'])) {
                $options['state']=explode(',',$options['state']);
            }
            if (isset($options['TSN'])) {
                $options['TSN']=explode(',',$options['TSN']);
            }
            if (isset($options['progList'])) {
                $options['progList']=explode(',',$options['progList']);
            }
        $programData = $this->extractor_model->get_program_data($options);    
        $plotData = $this->extractor_model->get_plot_data($options);
        $treeData = $this->extractor_model->get_tree_data($options);
      
//      make returned data into CSVs
        $programDataCSV = $this->extractor_model->data_to_csv($programData['data'], true);
        $plotDataCSV = $this->extractor_model->data_to_csv($plotData['data'], true);
        $treeDataCSV = $this->extractor_model->data_to_csv($treeData['data'], true);
        
        
        require_once(APPPATH.'libraries/pclzip/pclzip.lib.php');
        $rand=random_string('alnum',16);
        $created=FALSE;
        while (!$created){
            if(!is_dir($this->config->item('temp_path').$rand)) {
                mkdir($this->config->item('temp_path').$rand,0755);
                $dir=$this->config->item('temp_path').$rand;
                $created=TRUE;
            }
        }
        
        $programPath=$this->config->item('temp_path')."$rand/programs.csv";        
        $plotPath=$this->config->item('temp_path')."$rand/plots.csv";
        $treePath=$this->config->item('temp_path')."$rand/trees.csv";
        $zipPath=$this->config->item('temp_path')."$rand/search_results_data.zip";
        $zip= new PclZip($zipPath);  

        if ($programData['resultCount']>0){
            //open filestream for program data 
            $program_handle=fopen($programPath,'a');
            if (!$program_handle){
                show_error('could not open hand for program data');
            }
            fwrite($program_handle,$programDataCSV);
            fclose($program_handle);
            $zip->add($programPath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
        
        if ($plotData['resultCount']>0){
            //open filestream for plot data 
            $plot_handle=fopen($plotPath,'a');
            if (!$plot_handle){
                show_error('could not open hand for plot data');
            }
            fwrite($plot_handle,$plotDataCSV);
            fclose($plot_handle);
            $zip->add($plotPath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
        
        if ($treeData['resultCount']>0){
            //open filestream for tree data 
            $tree_handle=fopen($treePath,'a');
            if (!$tree_handle){
                show_error('could not open hand for tree data');
            }
            //Get each component, write it to a temp file, zip it up and then force download
            fwrite($tree_handle,$treeDataCSV);
            fclose($tree_handle);
            $zip->add($treePath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
        ob_clean(); 
        $data=file_get_contents($zipPath);
        $this->load->helper('download');
        force_download('search_results_data.zip',$data);
        echo json_encode($plotData);
    }

我也尝试了 force_download($zipPath, NULL) 但得到了相同的响应。

我错过了什么？？

谢谢！

Answer 1

感谢评论中帮助我解决问题的所有人。我不再使用 ajax 调用，而是使用了一个表单。这是视图：

<form action='<?php echo site_url('data/downloadDataSubset');?>' method='post'><input type='hidden' name='projectIDs' id='projectIDs'>Download Standardized Datasets: <input type='hidden' name='getData' id='getData'><button class="btn btn-secondary" id='downloadDataSubset'>CSV</button></form>

然后我将控制器方法名称更改为 downloadDataSubset（并删除了末尾的 echo），它成功了！这是新的控制器方法（在 Data.php 控制器中）。

    public function downloadDataSubset() {
        if (!$this->input->post()){
            echo json_encode(array('status'=>'failed','errors'=>array('Access Mode'=>'Disallowed')));
            exit();
        }
      
        $options = $this->input->post();       
            if (isset($options['state'])) {
                $options['state']=explode(',',$options['state']);
            }
            if (isset($options['TSN'])) {
                $options['TSN']=explode(',',$options['TSN']);
            }
            if (isset($options['progList'])) {
                $options['progList']=explode(',',$options['progList']);
            }
        $programData = $this->extractor_model->get_program_data($options);    
        $plotData = $this->extractor_model->get_plot_data($options);
        $treeData = $this->extractor_model->get_tree_data($options);
      
//      make returned data into CSVs
        $programDataCSV = $this->extractor_model->data_to_csv($programData['data'], true);
        $plotDataCSV = $this->extractor_model->data_to_csv($plotData['data'], true);
        $treeDataCSV = $this->extractor_model->data_to_csv($treeData['data'], true);
        
        
        require_once(APPPATH.'libraries/pclzip/pclzip.lib.php');
        $rand=random_string('alnum',16);
        $created=FALSE;
        while (!$created){
            if(!is_dir($this->config->item('temp_path').$rand)) {
                mkdir($this->config->item('temp_path').$rand,0755);
                $dir=$this->config->item('temp_path').$rand;
                $created=TRUE;
            }
        }
        
        $programPath=$this->config->item('temp_path')."$rand/programs.csv";        
        $plotPath=$this->config->item('temp_path')."$rand/plots.csv";
        $treePath=$this->config->item('temp_path')."$rand/trees.csv";
        $zipPath=$this->config->item('temp_path')."$rand/search_results_data.zip";
        $zip= new PclZip($zipPath);  

        if ($programData['resultCount']>0){
            //open filestream for program data 
            $program_handle=fopen($programPath,'a');
            if (!$program_handle){
                show_error('could not open hand for program data');
            }
            fwrite($program_handle,$programDataCSV);
            fclose($program_handle);
            $zip->add($programPath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
        
        if ($plotData['resultCount']>0){
            //open filestream for plot data 
            $plot_handle=fopen($plotPath,'a');
            if (!$plot_handle){
                show_error('could not open hand for plot data');
            }
            fwrite($plot_handle,$plotDataCSV);
            fclose($plot_handle);
            $zip->add($plotPath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
        
        if ($treeData['resultCount']>0){
            //open filestream for tree data 
            $tree_handle=fopen($treePath,'a');
            if (!$tree_handle){
                show_error('could not open hand for tree data');
            }
            //Get each component, write it to a temp file, zip it up and then force download
            fwrite($tree_handle,$treeDataCSV);
            fclose($tree_handle);
            $zip->add($treePath,PCLZIP_OPT_REMOVE_PATH,$this->config->item('temp_path').$rand);
        }
                    $data=file_get_contents($zipPath);
            $this->load->helper('download');
            force_download('search_results_data.zip',$data);
        
    }