How to get the browser to cache images, with PHP?

Question

I\'m totally new to how to cache images.

I output all images in a gallery with PHP, and want the images already shown, to be cached by the browser, so the PHP script

Answer 1

You could store the generated images in a directory called "showImage" so that you would embed them like this

Then you place a .htaccess file in the very same directory that will call showImage.php?id= in case the file does not exist, e.g.:

   RewriteEngine On
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteRule ^(.*)\.jpg$ showImage.php?id=$1 [QSA,L]

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Just read in your comment that you want to do client side caching: just set the caching-related HTTP headers according to http://www.mnot.net/cache_docs/