图像调整大小不起作用

Question

我正在使用以下代码，但即使$this->image_lib->resize()返回true也无法调整图像大小，不知道出了什么问题：

if(file_exists($_SERVER['DOCUMENT_ROOT']."/uploads/avatars/".str_replace('_','-',$image)))
{
    $config['source_image'] = $_SERVER['DOCUMENT_ROOT']."/uploads/avatars/".str_replace('_','-',$image);
}   
else if (!file_exists("./uploads/avatars/".$image) || $image=="")
{           
    $config['source_image'] = $_SERVER['DOCUMENT_ROOT'].'/uploads/avatars/photo.jpg';
}       
else
{           
    $config['source_image'] = $_SERVER['DOCUMENT_ROOT']."/uploads/avatars/".$image;
}
$config['image_library'] = 'gd2';           
$config['create_thumb'] = TRUE;
$config['maintain_ratio'] = TRUE;
$config['dynamic_output'] = TRUE;       
$config['width'] = $width;
$config['height'] = $height;

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

Answer 1

尝试使用new_image标记：

$config['new_image'] = '/path/to/new_image.jpg';

Answer 2

最好在CodeIgniter中使用SimpleImage.php作为帮助程序

$source=base_url().'/uploads/avatars/photo.jpg'; 
$image = new SimpleImage();
$image->load($source);
$image->resize(600,400);
$image->save($name_and_location);