<?php if ( ! defined(‘BASEPATH’)) exit(‘No direct script access allowed’);
class Thumb {
 
        //var $_dir = ’static/thumb’;
        var $_dim = ‘width’;
        var $_size = 75;
 
        function __construct()
        {
                // Nothing;
        }
 
        function GetThumb($resource, $dim, $size)
        {
                if (!file_exists($resource))
                        return;
 
                $this->CI =& get_instance();
 
                $this->_dim = $dim;
                $this->_size = $size;
 
                $fileinfo = get_file_info($resource);
                array_push($fileinfo, $this->_dim, $this->_size);
 
                $filehash = md5(serialize($fileinfo)).‘.’.end(explode(‘.’, $fileinfo[‘name’]));
 
                $filepath = crc32_hash($filehash).‘/’.$filehash;
 
                $thumbpath = $this->CI->path->GetThumbPath($filepath, ‘rel’);
 
                if (!file_exists($thumbpath))
                {
                        $this->GenThumb($resource, $thumbpath);
                }
                return $this->CI->path->GetThumbPath($filepath, ‘abs’);
 
        }
 
        function GenThumb($resource, $destination)
        {
                $create_dir = dirname($destination);
                if (!is_dir($create_dir))
                        mkdir($create_dir, 0777, true);
 
                $this->CI->load->library(‘image_lib’);
                $config[‘create_thumb’] = true;
                $config[‘thumb_marker’] = ”;
                $config[‘width’] = $this->_size;
                $config[‘height’] = $this->_size;
                $config[‘master_dim’] = $this->_dim;
                $config[’source_image’] = $resource;
                $config[‘new_image’] = $destination;
                $this->CI->image_lib->initialize($config);
                $this->CI->image_lib->resize();
        }
 
}
?>

<?php  if ( ! defined(‘BASEPATH’)) exit(‘No direct script access allowed’);
if (!function_exists(‘crc32_hash’))
{
        function crc32_hash($key, $max=5000)
        {
                return (crc32($key) & 0×7fffffff) % $max;
        }
}
?>

$this->load->library(‘thumb’);
echo "<img src=’".$this->thumb->GetThumb(’some/original/file.jpg’, ‘width’, 300)."’ />";