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Explain me the displaying four shirts in layman terms

I am no expert and trying hard to wrap my head around php and i am stuck on this video. Can someone tell me in layman or easy example of how to display 4 items out of lets say 10, in layman terms taking example from this video?

PLUS

It's pretty much how he described in the video.

All he's doing is keeping track of how many shirts have been looped through, subtracting that from the total number (which is retrieved at the beginning of the loop) and then starting to display them when the variable keeping track of the remaining shirts is less than four (or whatever number you want to display).

Good enough for logic but i would need some example in easy terms.

There isn't really much else to add to what Ryan has already said.

What you need are counter variables that keep track of what is going on. suppose you have ten apples. I have a counter of how many apples I currently have - this starts at 10. I give you apples, 1 at a time. I have a counter of how many apples I gave you - this starts at 0. I have x amount of apples left(where x is equal to my starting count - how many apples I gave you).

Therefore I have 4 apples left when my X count = 4. When this happens you have 6 apples. The sum of 4 +6 =10.

You can utilise the traditional for loop to do this, but creating the counters are better.

Once you have 4 apples left, additional code will run that will display the apples.