Codeigniter实现智能裁剪图片的方法

$this->load->library('image_lib');           
    list($width, $height) = getimagesize("upload/123.jpg");
    $config['image_library'] = 'gd2';
    $config['source_image'] = 'upload/123.jpg';
    $config['maintain_ratio'] = TRUE;
    if($width >= $height)
    {
        $config['master_dim'] = 'height';
    }else{
        $config['master_dim'] = 'width';
    }
    $config['width'] = 240;
    $config['height'] = 240;
    $this->image_lib->initialize($config);
    $this->image_lib->resize();

    $config['maintain_ratio'] = FALSE;
    if($width >= $height)
    {
        $config['x_axis'] = floor(($width * 240 / $height - 240)/2);
    }else{
        $config['y_axis'] = floor(($height * 240 / $width - 240)/2);
    }
    $this->image_lib->initialize($config);
    $this->image_lib->crop();