codeigniter $this->image_lib->resize() 函数不调整图像大小

Question

我想调整图像大小，但它不能正常工作，$this->image_lib->resize() 这个函数不能调整图像大小。它产生原始图像尺寸。我正在上传 600*600 尺寸的图片。但我想调整大小 300*300 请检查下面我的代码。

if( $this->input->post('save')){

        $config['upload_path'] = 'images';
        $config['allowed_types'] = 'jpg|png';
        $config['max_size'] = 1000;
        $config['overwrite'] = false;
        $config['encrypt_name'] = true;
        $this->load->library('upload', $config);

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

        if(!$this->upload->do_upload('user_image')){
            $this->session->set_flashdata('message', $this->upload->display_errors());
            $this->load->view('create',$data);
            return;
        }else{
            $upicture = $this->upload->data();
            $image_data = $upicture;
            $config2['image_library'] = 'gd2';
            $config2['source_image'] = $image_data['full_path']; //get original image
            $config2 ['new_image'] = 'images'; //save as new image //need to create thumbs first
            $config2 ['maintain_ratio'] = false;
            $config2 ['create_thumb'] = false;
            $config2 ['overwrite'] = false;
            $config2['width'] = 300;
            $config2['height'] = 300;
            $this->load->library('image_lib', $config2);
            $this->image_lib->resize();

            $img_name = $upicture['file_name'];
        }


        $this->form_validation->set_rules('student_name', 'Student Name','required');
        $this->form_validation->set_rules('student_email', 'Student Email','required|valid_email|is_unique[std_info.std_email]',['is_unique'=> 'The {field} field is alredy exits']);

        $this->form_validation->set_message('valid_email','This {field} field is invalid');
        //$this->form_validation->set_message('is_unique', 'This {field} is Alreay exist!');


        $receive = $this->input->post(['student_name','student_email','student_about'], TRUE);
        $param = [
            'std_name'  => (string) $receive['student_name'],
            'std_email' => (string) $receive['student_email'],
            'std_about' => (string) $receive['student_about'],
            'images'    => $img_name
        ];
        if($this->form_validation->run()){
            $response = $this->std_model->insert_data('std_info',$param);
            if($response['status'] === 'success'){
                redirect('welcome');
            }
        }else{
            $this->load->view('create',$data);
            return;
        }

    }

Answer 1

If neither of the two preferences listed above (create_thumb, and new_image) are used, the resizing method will instead target the original image for processing.

我测试了您的代码，根据我的猜测，您应该执行以下操作：

$config2['image_library'] = 'gd2';
$config2['source_image'] = $image_data['full_path']; //get original image
//$config2 ['new_image'] = 'images'; //save as new image //need to create thumbs first
$config2 ['maintain_ratio'] = false;
$config2 ['create_thumb'] = false;
//$config2 ['overwrite'] = true;
$config2['width'] = 300;
$config2['height'] = 300;

From the documentation on Creating a Copy: "The resizing method will create a copy of the image file (and preserve the original) if you set a path and/or a new filename using this preference"

https://www.codeigniter.com/userguide3/libraries/image_lib.html

如果您想保留原件并留个拇指，请在 new_image 字段中为文件重新命名，如 'images/someimage.jpg' 或将 create_thumb 设置为 TRUE。

重构

我还强烈建议重构您的逻辑。假设表单验证失败，你会留下很多孤立的图像，因为每个 post 都会制作一个新图像（并且你没有覆盖或已知文件名）。所以先做表单验证，然后上传，然后添加到数据库：

if ($this->input->post('save')) {
    $this->form_validation->set_rules('student_name', 'Student Name', 'required');
    $this->form_validation->set_rules('student_email', 'Student Email', 'required|valid_email|is_unique[std_info.std_email]', ['is_unique' => 'The {field} field is alredy exits']);
    $this->form_validation->set_message('valid_email', 'This {field} field is invalid');
    if (!$this->form_validation->run()) {
        $this->load->view('create', $data);
        return;
    }
    $config['upload_path'] = 'images';
    $config['allowed_types'] = 'jpg|png';
    $config['max_size'] = 1000;
    $config['overwrite'] = false;
    $config['encrypt_name'] = true;
    $this->load->library('upload', $config);
    $this->upload->initialize($config);
    if (!$this->upload->do_upload('user_image')) {
        $this->session->set_flashdata('message', $this->upload->display_errors());
        $this->load->view('create', $data);
        return;
    }
    $image_data = $this->upload->data();
    $config2['image_library'] = 'gd2';
    $config2['source_image'] = $image_data['full_path']; //get original image
    //$config2['new_image'] = 'images'; //save as new image //need to create thumbs first
    $config2['maintain_ratio'] = false;
    $config2['create_thumb'] = false;
    //$config2['overwrite'] = false;
    $config2['width'] = 300;
    $config2['height'] = 300;
    $this->load->library('image_lib', $config2);
    if (!$this->image_lib->resize()) {
        $this->session->set_flashdata('message', $this->image_lib->display_errors());
        $this->load->view('create', $data);
        return;
    }
    $receive = $this->input->post(['student_name', 'student_email', 'student_about'], TRUE);
    $param = [
        'std_name' => (string) $receive['student_name'],
        'std_email' => (string) $receive['student_email'],
        'std_about' => (string) $receive['student_about'],
        'images' => $image_data['file_name']
    ];
    $response = $this->std_model->insert_data('std_info', $param);
    if ($response['status'] === 'success') {
        redirect('welcome');
    }
}

codeigniter $this->image_lib->resize() 函数不调整图像大小

codeigniter $this->image_lib->resize() function not resizing image

php

resize

codeigniter

image

重构