Question

I store the original image path(included file name) in db when upload an image.

For example:
img/uploaded/photo.jpg

Then I generate its thumbnail and store in below directory NOT in db.

/img/uploaded/thumbs/photo_thumb.jpg

And I have following function but no idea how to get the thumb which belong to the url in db.

//ie: $file is img/uploaded/photo.jpg
public function get_thumb($file)
{
    //get the path without filename
    $get_path = dirname($file) . "/thumbs/";

    //result img/uploaded/thumbs/  (how can i get the photo_thumb.jpg) here?
    return $get_path; 
}

Edit
basename($file) to get filename from path but how to add _thumb.jpg?

Answer 1

Don’t have much experience with PHP but using this as starting point, I get:

$pattern = '/^.*\/(.*)$/'; // match everything after the last slash and store it in $1
$replacement = '$1';
$filename = preg_replace($pattern, $replacement, $file);

$get_path = $file . '/thumbs/' . $filename;

As I said, not much experience with PHP, but this should do it…

A more easy way to do this, could be:

1. Find the last / in $file
2. Insert thumbs/ after it or replace it with /thumbs/
3. Find the last . in the edited $file
4. Insert _thumb after it

You can find the postitions of / and . with the strrchr function (documented here).