左连接一个关联数组

I'm trying to make an image gallery. There are albums with images in it and on the index page I want to show witch albums there are and when you click on it you go to that album. I can show the album name but I want to show these albums with the images that is inside that album, with a random function. I hope that you understand what I want to do. The problem is that I can't reach the images.I'm trying to make an image gallery. There are