调整图像大小时，Codeigner图像会旋转 - Codeigniter image rotate when image resize

我有一张尺寸为（W-3000 X H-4000）的图像。当我上传它并调整大小时，它总是像横向模式一样显示，意味着新的维度是w-1067 X h-800。我想创建此图片800X600为横向或600X800为纵向。这是我的代码：

    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'jpg|jpeg|gif|png';
    $config['max_size'] = '5000';
    $this->load->library('upload', $config);
    //check if a file is being uploaded
    if(strlen($_FILES["testimg"]["name"])>0){
        if ( !$this->upload->do_upload("testimg"))//Check if upload is unsuccessful
        {
            $error = array('error' => $this->upload->display_errors());
            print_r($errors);
        }
        else
        {
            $config['image_library'] = 'gd2';
            $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
            $config['width'] = '1';
            $config['height'] = '800';
            $config['maintain_ratio'] = TRUE;
            $config['master_dim'] = 'height';
            $this->load->library('image_lib',$config); 
            if (!$this->image_lib->resize()){  
                echo "error";
            }else{
                echo "success";
            }
       }      
   }

在我的代码中，高度总是800px。3000X4000尺寸的图像可以。但是当我使用4000X3000尺寸的图像时呢？有人能帮我解决这个问题吗？感谢

感谢@Rpojka的回答。但我用exif_read_data（）修复了它。这是我的代码：

    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'jpg|jpeg|gif|png';
    $config['max_size'] = '6048';
    $this->load->library('upload', $config);
    //check if a file is being uploaded
    if(strlen($_FILES["testimg"]["name"])>0){
        if ( !$this->upload->do_upload("testimg"))//Check if upload is unsuccessful
        {
            $error = array('error' => $this->upload->display_errors());
            print_r($errors);
        }
        else
        {
            $config['image_library'] = 'gd2';
            $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
            $filename = $_FILES['testimg']['tmp_name'];

            $imgdata=exif_read_data($this->upload->upload_path.$this->upload->file_name, 'IFD0');

            list($width, $height) = getimagesize($filename);
            if ($width >= $height){
                $config['width'] = 800;
            }
            else{
                $config['height'] = 800;
            }
            $config['master_dim'] = 'auto';

            $this->load->library('image_lib',$config); 
            if (!$this->image_lib->resize()){  
                echo "error";
            }else{
                $this->image_lib->clear();
                $config=array();
                $config['image_library'] = 'gd2';
                $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;

                switch($imgdata['Orientation']) {
                    case 3:
                        $config['rotation_angle']='180';
                        break;
                    case 6:
                        $config['rotation_angle']='270';
                        break;
                    case 8:
                        $config['rotation_angle']='90';
                        break;
                }
                $this->image_lib->initialize($config); 
                $this->image_lib->rotate();
            }
       }      
   }

这是exif方向图

 1        2       3      4         5            6           7          8
888888  888888      88  88      8888888888  88                  88  8888888888
88          88      88  88      88  88      88  88          88  88      88  88
8888      8888    8888  8888    88          8888888888  8888888888          88
88          88      88  88
88          88  888888  888888

$filename = $_FILES['testing']['tmp_name'];
list($width, $height) = getimagesize($filename);
if ($width >= $height)
{
    $config['width'] = 800;
    $config['master_dim'] = 'width';
}
else
{
    $config['height'] = 800;
    $config['master_dim'] = 'height';
}

更短的是，您可以对master_dim使用"auto"参数，该参数将确定哪个值更大——宽度或高度。

$filename = $_FILES['testing']['tmp_name'];
list($width, $height) = getimagesize($filename);
if ($width >= $height)
{
    $config['width'] = 800;
}
else
{
    $config['height'] = 800;
}
$config['master_dim'] = 'auto';