CodeIgniter上传图片并调整大小

Question

我正在尝试上传图像并调整其大小，目前已经可以上传和创建缩略图。但是我无法将原始图像调整大小。所有的操作都只是将文件以原始尺寸直接上传到文件夹中。我猜我想要做的是调整图像大小然后覆盖已上传的原始文件。

以下是我的代码，请问我漏了什么：

//Initialise the upload file class
    $config['upload_path'] = './image_uploads/';
    $config['allowed_types'] = 'jpg|jpeg|gif|png';
    $config['max_size'] = '6048';
    $this->load->library('upload', $config);

    $userfile = "_upload_image";
            //check if a file is being uploaded
            if(strlen($_FILES["_upload_image"]["name"])>0){

                if ( !$this->upload->do_upload($userfile))//Check if upload is unsuccessful
                {
                    $upload_errors = $this->upload->display_errors('', '');
                    $this->session->set_flashdata('errors', 'Error: '.$upload_errors);   
                    redirect('admin/view_food/'.$food->course_id);  
                }
                else
                {
                    //$image_data = $this->upload->data();

                     ////[ THUMB IMAGE ]
                    $config2['image_library'] = 'gd2';
                    $config2['source_image'] = $this->upload->upload_path.$this->upload->file_name;
                    $config2['new_image'] = './image_uploads/thumbs';
                    $config2['maintain_ratio'] = TRUE;
                    $config2['create_thumb'] = TRUE;
                    $config2['thumb_marker'] = '_thumb';
                    $config2['width'] = 75;
                    $config2['height'] = 50;
                    $this->load->library('image_lib',$config2); 

                    if ( !$this->image_lib->resize()){
                $this->session->set_flashdata('errors', $this->image_lib->display_errors('', ''));   
              }

                    //[ MAIN IMAGE ]
                    $config['image_library'] = 'gd2';
                    $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
                    //$config['new_image'] = './image_uploads/';
                    $config['maintain_ratio'] = TRUE;
                    $config['width'] = 250;
                    $config['height'] = 250;
                    $this->load->library('image_lib',$config); 

                    if ( !$this->image_lib->resize()){
                $this->session->set_flashdata('errors', $this->image_lib->display_errors('', ''));   
              }
               }      
           }  

- user794846

Answer 1

你试过将这个添加到配置选项中吗？

$config['overwrite'] = TRUE;

这应该可以解决问题。

根据文档

如果设置为true，则如果存在与您要上传的文件同名的文件，它将被覆盖。如果设置为false，则如果存在另一个同名文件，则会在文件名后附加一个数字。

- Altrim

Answer 2

我已经试了20个小时去创建缩略图，但一直没有成功，直到我意识到我在代码中出错的地方——我没有初始化我的配置数组！！！

在加载image_lib后添加这行代码即可：

$this->image_lib->initialize($config);

希望这对你有用......点赞！

- Maitho David

Answer 3

如果你喜欢使用CI处理图像，我强烈推荐使用image_moo库。

- Mehmet Uyarovic