Question

I have written a script image.php that is quite long, but I’ve just copied a portion of the code below.

Note that:

$image = $_GET['ph'];
$w = $_GET['w'];

So that:

function getImage_w($image, $w){
    $ext = strrchr($image, ".");
    if (strtolower($ext) == '.jpg' || strtolower($ext) == '.jpeg'){
        header('Content-type: image/jpeg');

        $src_im_jpg = imagecreatefromjpeg($image);
        $size = getimagesize($image);

        $src_w = $size[0];
        $src_h = $size[1];
        $dst_w = $w;
        $dst_h = round(($dst_w/$src_w)*$src_h);
        $dst_im = imagecreatetruecolor($dst_w,$dst_h);

        imagecopyresampled($dst_im,$src_im_jpg,0,0,0,0,$dst_w,$dst_h,$src_w,$src_h);

        imagejpeg($dst_im);
    }
}

This script takes a two GET variables, $_GET['ph'] and $_GET['w'], ph defines the URL of the image, and w defines the destination resize width.

For example: If my script is in a libs/ directory, and my photos are in a resources directory, and I want to display my photo with width = 100, I have to use this html:

<img src="libs/image.php?ph=../resources/myimage.jpg&w=100">

My problem is, my images appear in the browser correctly, but with a bad url format. I’d like to put images alt attribute instead of this url in the images property.

And to automatically apply the image.php for an image request.

Also, I have a problem when the user wants to save the image in his desktop, the image saves under a name image.php, which is not desirable.

Thank you in advance.

Answer 1

RewriteEngine on
#change 'resize' to the folder your image.php is in
RewriteBase /resize

#e.g. /resize/path/to/image/sample-200.jpg
# will become /resize/image.php?ph=path/to/image/sample.jpg&w=200
RewriteRule ^(.*)-([0-9]+)(\.jpg)$ image.php?ph=$1$3&w=$2 [L,NC]

Note that you can’t use .. in the url, so instead use root-relative url. To do this you need to add the document_root the the path in you php file:

$image = $_SERVER['DOCUMENT_ROOT'] . "/" . str_replace('..','', $_GET['ph']);

Users saving the image will get the normal image name, but with a ‘-‘ and the size added to the end.

Not sure what you want with the alt. Also I don’t think it is wise to rewrite all images, so this script only rewrites images the start with /resize/…

http://www.example.com/hosting.jpg is not possible, as the php doesn’t know in which folder to look for this image, and to what size to resize it.