php - Codeigniter 替换上传的图片

Question

我正在使用 Codeigniter 的 File Uploading Class用于上传用户头像。有没有办法在他/她上传新图像文件时替换用户的图像文件？我想用上传的最新头像替换现有头像。

我的图片上传 Controller

function upload_avatar()
    {
        $config['upload_path'] = './uploads/avatars/';
        $config['allowed_types'] = 'jpg|png';
        $config['overwrite'] = FALSE; //overwrite user avatar
        $config['encrypt_name'] = TRUE;
        $config['max_size'] = '200'; //in KB

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

        if ( ! $this->upload->do_upload())
        {
            $error = $this->upload->display_errors(); 

            $this->session->set_flashdata('error', $error);

            redirect('/settings/avatar');
        }
        else
        {                
            $config['image_library'] = 'gd2';
            $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
            $config['create_thumb'] = FALSE;
            $config['maintain_ratio'] = FALSE;
            $config['width'] = 120;
            $config['height'] = 120;

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

            $this->image_lib->crop();

            //Add image path to database
            $avatar_path = 'uploads/avatars/' . $this->upload->file_name;
            $user_id = $this->tank_auth->get_user_id();
            $this->Settings_model->update_avatar($avatar_path, $user_id);

            $this->session->set_flashdata('success', 'Avatar updated!');

            redirect('/settings/avatar');
        }
    }

Answer 1

有一个公共(public)属性overwrite 指示覆盖原始文件的决定。默认情况下，新文件名是基于原始文件名创建的。这是 CI 中 Upload.php 的来源:

/*
 * Validate the file name
 * This function appends an number onto the end of
 * the file if one with the same name already exists.
 * If it returns false there was a problem.
 */
$this->orig_name = $this->file_name;

if ($this->overwrite == FALSE)
{
    $this->file_name = $this->set_filename($this->upload_path, $this->file_name);

    if ($this->file_name === FALSE)
    {
        return FALSE;
    }
}

因此，要使覆盖正常工作，您需要做的就是:

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