如何在codeigniter中上传图片？

Question

我正在尝试上传根文件夹中的图像及其在数据库中的文件名。这是我为上传功能所做的：

       public function add_blog($id=0){
       if(!empty($_FILES['picture']['name'])){
             $config['upload_path'] = 'uploads/blog_image';
             $config['allowed_types'] = 'jpg|jpeg|png|gif';
             $config['file_name'] = $_FILES['picture']['name'];

             //Load upload library and initialize configuration
             $this->load->library('upload',$config);
             $this->upload->initialize($config);
             // print_r($value['name'][$s]);exit;
             if($this->upload->do_upload('picture')){
                 $uploadData = $this->upload->data();
                 $picture = $uploadData['file_name'];
                  print_r($picture); exit;
             }
           }
             print_r($config['file_name']); exit;


     $data['blog_data']=array('blog_post'=>$this->input->post('blog_post'),
                          'posted_by'=>$this->input->post('posted_by'),
                           'blog_image'=>$picture);

 if ($id==0){
      $this->db->insert('blog',$data['blog_data']);
        // $last_id = $this->db->insert_id();

      }
    else {
     $this->db->where('id',$id);
    //  $last_id = $this->db->insert_id();
     $this->db->update('blog',$data['blog_data']);

 }
 }

这里的问题是我能够插入除图像之外的其他数据。如果我执行 print_r() 并退出，我会得到带有 print_r($config[file_name]) 的图像名称，否则它只会插入除图像之外的其他数据。但是图像既没有上传到根文件夹，也没有上传到数据库中。如果我给出不存在的上传路径，那么它也不会引发任何错误。我认为 If 里面的代码没有被执行。我该如何解决这个问题？提前致谢。

Answer 1

private function _upload_image(  ) {
    $this->load->library( 'upload' );
    if ($_FILES && $_FILES['picture']['name'] !== ""){
        $config['upload_path']   = 'uploads/blog_image';
        $config['allowed_types'] = 'jpg|jpeg|png|bmp';
        $config['max_size']      = 10000;
        /*the picture name must be unique, use function now()*/
        $config['file_name']     = $_FILES['picture']['name'] . now();
        $config['file_ext_tolower']     = TRUE;
        $this->upload->initialize( $config );
        if ( $this->upload->do_upload( 'picture' ) ){
            $file_name = $this->upload->data()['file_name'];
            $full_path = $this->upload->data()['full_path'];
            /*If you want create a thumb, use this part*/
            $this->load->library('image_lib');
            $config = array(
                'source_image'      => $path,
                'new_image'         => $this->_image_path,
                'maintain_ratio'    => true,
                'width'             => 128,
                'height'            => 128,
                'create_thumb'      => TRUE,
                'thumb_marker'      => '_thumb',
            );
            $this->image_lib->initialize( $config );
            $this->image_lib->resize();
            /*Save in database*/
            $this->db->insert('blog', [
                 'file_name' => $file_name,
                 'full_path' => $full_path
            ]);
        } else {
            //if picture is empty, do something
        }
    }
}

您不需要使用 $_FILES && $_FILES ['picture']['name']！ == "" 仅当您的表单具有图片字段作为可选字段时，$this->upload->do_upload('picture') 并从 $this->upload->data() 获取数据，请阅读手册

public function add_blog()
    {
            $config['upload_path']          = '.uploads/blog_image';
            $config['allowed_types']        = 'jpg|jpeg|png|gif';
            $config['max_size']             = 10000;

            $this->load->library('upload', $config);

            if ( ! $this->upload->do_upload('picture'))
            {//Do something with errors
                    $errors = $this->upload->display_errors();
            }
            else
            {
                    $data = $this->upload->data();
                    $this->db->insert('blog', [
                           'file_name' => $data['file_name'],
                           'full_path' => $data['full_path']
                   ]);
            }
    }

Answer 2

我只是没有提到要上传的文件大小。我在上面的代码中做了这个并且工作了。 编辑

    public function add_blog($id=0){
       if(!empty($_FILES['picture']['name'])){
             $config['upload_path'] = 'uploads/blog_image';
             $config['allowed_types'] = 'jpg|jpeg|png|gif';
             $config['max_size']             = 0;
             $config['file_name'] = $_FILES['picture']['name'];

             //Load upload library and initialize configuration
             $this->load->library('upload',$config);
             $this->upload->initialize($config);
             // print_r($value['name'][$s]);exit;
             if($this->upload->do_upload('picture')){
                 $uploadData = $this->upload->data();
                 $picture = $uploadData['file_name'];
                  // print_r($picture); exit;
             }
           }
            //  print_r($config['file_name']); exit;


 $data['blog_data']=array('blog_post'=>$this->input->post('blog_post'),
                          'posted_by'=>$this->input->post('posted_by'),
                           'blog_image'=>$picture);

 if ($id==0){
      $this->db->insert('blog',$data['blog_data']);
        // $last_id = $this->db->insert_id();

 }
 else {
     $this->db->where('id',$id);
    //  $last_id = $this->db->insert_id();
     $this->db->update('blog',$data['blog_data']);

 }
 }

此代码适用于插入和更新。