Resample script, how to make it work in an existing website with different img urls

Question

I've being provided with a code which can resize/resample images from a url. I would like to have this code implemented in my website. The resample script is pretty straightforward, but I really don't know how to make it work with the rest of the website. I really hope someone can help me with this problem.

The code which produces a thumbnail is the following, this is a part of the code at the bottom of this post

$img_attributes= 'style="max-height: 100px; max-width: 100px"' . ' title="' . htmlspecialchars($product['product_name']) . '"';

This is the code which can resample a image:

<?php
// The file
$filename = 'http://valplibrary.files.wordpress.com/2009/01/5b585d_merry-christmas-blue-style.jpg';
$percent = 0.5; // percentage of resize

// Content type
header('Content-type: image/jpeg');

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Output
imagejpeg($image_p, null, 100);
?>

This is the whole code which is partly responsible for the thumnails at my website.

<?php 
if( !defined( '_VALID_MOS' ) && !defined( '_JEXEC' ) ) die( 'Direct Access to '.basename(__FILE__).' is not allowed.' ); 
/**
* This is the theme's function file.
* It allows you to declare additional functions and classes
* that may be used in your templates 
*
* @version $Id: theme.php 1427 2008-06-18 20:04:01Z soeren_nb $
* @package VirtueMart
* @subpackage themes
* @copyright Copyright (C) 2006-2008 soeren - All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.php
* VirtueMart is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See /administrator/components/com_virtuemart/COPYRIGHT.php for copyright notices and details.
*
* http://virtuemart.net
*/
global $mainframe;

// include the stylesheet for this template

$vm_mainframe->addScriptDeclaration("window.templatePath = '".JURI::base()."';");
$vm_mainframe->addStyleSheet( VM_THEMEURL.'theme.css' );
$vm_mainframe->addScript( VM_THEMEURL.'theme.js' );


// Reset of VM defaults JS bits
define ("_MOOTOOLS_LOADED", "1");
define ("_SLIMBOX_LOADED", "1");
vmRequest::setVar("usefetchscript", 0, "session");

class rokCommonHTML extends vmCommonHTML {
    function getRokboxImageLink($image_link, $text, $title='', $image_group='') {
        if( $image_group ) {
            $image_group = '('.$image_group.')';
        }

        $img = str_replace(JURI::base(), '', $image_link);
        if ($img_size = @getimagesize($img)) $size = "[{$img_size[0]} {$img_size[1]}]";
        else $size = "";
        $link = rokCommonHTML::hyperLink( $image_link, $text, '', $title, 'rel="rokbox'.$size.$image_group.'"' );

        return $link;
    }
}
// End of Reset

class vmTheme extends vmTemplate  {

    function vmTheme() {
        parent::vmTemplate();

        // Removing this, since we're loading it already from our template
        //vmCommonHTML::loadMooTools();
    }

    function vmBuildFullImageLink( $product ) {
        global $VM_LANG;

        $product_image = '';

        $img_attributes= 'style="max-height: 100px; max-width: 100px"' . ' title="' . htmlspecialchars($product['product_name']) . '"';


        /* Wrap the Image into an URL when applicable */
        if ( @$product["product_url"] ) {
            $product_image = "<a href=\"". $product["product_url"]."\" title=\"".$product['product_name']."\" target=\"_blank\">";
            $product_image .= ps_product::image_tag($product['product_thumb_image'], $img_attributes, 0);
            $product_image .= "</a>";
        }
        /* Show the Thumbnail with a Link to the full IMAGE */
        else {
            if( empty($product['product_full_image'] ) ) {
                $product_image = "<img src=\"".VM_THEMEURL.'images/'.NO_IMAGE."\" alt=\"".$product['product_name']."\" border=\"0\" />";
            }
            else {
                // file_exists doesn't work on remote files,
                // so returns false on remote files
                // This should fix the "Long Page generation bug"
                if( file_exists( IMAGEPATH.'product/'.$product['product_full_image'] )) {

                    /* Get image width and height */
                    if( $image_info = @getimagesize(IMAGEPATH.'product/'.$product['product_full_image'] ) ) {
                        $width = $image_info[0] + 20;
                        $height = $image_info[1] + 20;
                    }
                }
                else {
                    $width = 640;
                    $height= 480;
                }
                if( stristr( $product['product_full_image'], "http" ) ) {
                    $imageurl = $product['product_full_image'];
                }
                else {
                    $imageurl = IMAGEURL.'product/'.rawurlencode( $VM_LANG->convert($product['product_full_image']));
                }
                /* Build the "See Bigger Image" Link */
                if( @$_REQUEST['output'] != "pdf" && $this->get_cfg('useLightBoxImages', 1 ) ) {
                    $link = $imageurl;
                    $text = ps_product::image_tag($product['product_thumb_image'], $img_attributes, 0)."<br/>".$VM_LANG->_('PHPSHOP_FLYPAGE_ENLARGE_IMAGE');

                    //$product_image = vmCommonHTML::getLightboxImageLink( $link, $text, $product['product_name'], 'product'.$product['product_id'] );
                    $product_image = rokCommonHTML::getRokboxImageLink( $link, $text, $product['product_name'], 'product'.$product['product_id'] );
                }
                elseif( @$_REQUEST['output'] != "pdf" ) {
                    $link = $imageurl;
                    $text = ps_product::image_tag($product['product_thumb_image'], $img_attributes, 0)."<br/>".$VM_LANG->_('PHPSHOP_FLYPAGE_ENLARGE_IMAGE');
                    // vmPopupLink can be found in: htmlTools.class.php
                    $product_image = vmPopupLink( $link, $text, $width, $height );
                }
                else {
                    $product_image = "<a href=\"$imageurl\" target=\"_blank\">"
                                    . ps_product::image_tag($product['product_thumb_image'], $img_attributes, 0)
                                    . "</a>";
                }
            }
        }
        return $product_image;
    }

    /**
     * Builds a list of all additional images
     *
     * @param int $product_id
     * @param array $images
     * @return string
     */
    function vmlistAdditionalImages( $product_id, $images, $title='', $limit=1000 ) {
        global $sess;
        $html = '';
        $i = 0;
        foreach( $images as $image ) { 
            $thumbtag = ps_product::image_tag( $image->file_name, 'class="browseProductImage"', 1, 'product', $image->file_image_thumb_width, $image->file_image_thumb_height );
            $fulladdress = $sess->url( 'index2.php?page=shop.view_images&amp;image_id='.$image->file_id.'&amp;product_id='.$product_id.'&amp;pop=1' );

            if( $this->get_cfg('useLightBoxImages', 1 )) {
                //$html .= vmCommonHTML::getLightboxImageLink( $image->file_url, $thumbtag, $title ? $title : $image->file_title, 'product'.$product_id );
                $html .= rokCommonHTML::getRokboxImageLink( $image->file_url, $thumbtag, $title ? $title : $image->file_title, 'product'.$product_id );
            }
            else {
                $html .= vmPopupLink( $fulladdress, $thumbtag, 640, 550 );
            }
            $html .= ' ';
            if( ++$i > $limit ) break;
        }
        return $html;
    }
    /**
     * Builds the "more images" link
     *
     * @param array $images
     */
    function vmMoreImagesLink( $images ) {
        global $mosConfig_live_site, $VM_LANG, $sess;
        /* Build the JavaScript Link */
        $url = $sess->url( "index2.php?page=shop.view_images&amp;flypage=".@$_REQUEST['flypage']."&amp;product_id=".@$_REQUEST['product_id']."&amp;category_id=".@$_REQUEST['category_id']."&amp;pop=1" );
        $text = $VM_LANG->_('PHPSHOP_MORE_IMAGES').'('.count($images).')';
        $image = vmCommonHTML::imageTag( VM_THEMEURL.'images/more_images.png', $text, '', '16', '16' );

        return vmPopupLink( $url, $image.'<br />'.$text, 640, 550, '_blank', '', 'screenX=100,screenY=100' );
    }


    // Your code here please...

}
?>

Answer 1

A bit wall of code ish, but having given it a quick look, the two methods of doing what you want are either to have the resample script take a filename argument. For example, in the HTML you could put

src="resample.php?myjpg.jpg"

And alter the respamler (You need error checking as well, people could do nasty things)

<?php
$filename = 'http://valplibrary.files.wordpress.com/'.key($_GET);

The other method is to use htaccess (or the IIS alternative if you don't use Apache) to rewrite urls, which is a neater solution. Create a directory called thumbs, and put the script and the htacess file in.

Use the .htaccess file to match

http://valplibrary.files.wordpress.com/thumbs/(.*)

And rewrite the url to

resample.php?$1 #(where $1 is the value in (.*))

I hope these give you ideas.