Image on pressing F5/Ctrl+F5

I'm making a website using PHP. I have an image handler which handles the images and cache them. My problem is when I press F5 many times the images sometimes does not show or not cache. Can anyone help me with t开发者_开发知识库hat kind of problem or suggest me whats the best solution.

So I am guessing you are pressing F5 to refresh the page. Depending on the browser, F5 refreshes the page and may get new cache content whereas pressing CTRL+F5 will force a cache refresh.

If you post what browser you are using and possibly a link to the site, we might be able to help more.