What is meant by this code?

[Abdul Abdul <abdul.sw84@xxxxxxxxx>]

Hello,

I'm new to PHP. I came across the following code:

....
....
$exif = exif_read_data($image);
foreach ($exif as $key => $section) {
foreach ($section as $name => $val) {
.....
.....

What are we doing here in the "foreach"? What is "as"?

Thanks.