Image thumb helper that keeps the thumbnail once it's created. Must mod Image_lib to account for transparent PNGs.

JR's CodeIgniter Image Thumb Helper

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
if ( ! function_exists('image_thumb_helper')){
	function image_thumb($image_path, $filename, $height, $width){
		$filename = preg_replace('/\.png/','_',$filename);
		// Get the CodeIgniter super object
    $CI =& get_instance();
		// Path to image thumbnail
    $image_thumb = dirname($image_path) . '/'.$filename . $height . '_' . $width . '.png';
		if( ! file_exists($image_thumb)){
        // LOAD LIBRARY
        $CI->load->library('image_lib');
				
	// CONFIGURE IMAGE LIBRARY
        $config['image_library']    = 'gd2';
        $config['source_image']     = $image_path;
        $config['new_image']        = $image_thumb;
        $config['maintain_ratio']   = TRUE;
        $config['height']           = $height;
        $config['width']            = $width;
        $CI->image_lib->initialize($config);
				
				$CI->image_lib->resize();
        $CI->image_lib->clear();
    }

		return '<img src="' . dirname($_SERVER['SCRIPT_NAME']) . '/' . $image_thumb . '" />';
	}	
}
/* End of file image_helper.php */
/* Location: ./application/helpers/image_helper.php */