构建一个PHP函数来显示多维数组中的图像库

I've spent most of the day trying to wrap my head around multidimensional arrays, in order to build a PHP function that I can call to populate an image gallery that could potentially hold 100s of elements. At this point it would have been easier to just copy and paste the HTML portion over and over again, but I'd like to figure out how to make this work, for future projects. I've spent most of the day trying to wrap my he