在打印2行后，php foreach甚至奇数反之亦然

Question

In my application I have to loop images with two sizes. Lets call them large and small.. These images are in two columns like below.

large small
large small
large small

I produce the larage/small image by a class by doing this now like this:

<?php $count = 0; ?>
<?php foreach ($posts as $post) : ?>
<div class=" <?=(++$count%2 ? "col-7 pr-10" : "col-5 pl-10");?> mt-15">
<?php endforeach; ?>

What I would like to do here by now is to produce this list;

large small
small large
large small
etc..

In what kind of way can I do this? I guess I have to create a kind of reset after each 2 entries and set odd to eve and vise versa ?

Answer 1

In general if you need A B; B A; A B; etc in consecutive loops, you could do this:

$row = 0;
foreach ($posts as $post) {
  if ($row%2) echo "A, B
"; else echo "B, A
";
  $row++;
}

This looks quite a bit like your code…

If instead you really mean that you need to do

A
B
B
A

(pattern repeating every 4th row, in essence), then a clear and reasonable approach is:

$row = 0;
foreach ($posts as $post) {
  $temp = $row%4;
  if ($temp == 0 || $temp == 3 ) echo "A
"; else echo "B
";
  $row++;
}

This can obviously be made more compact - but I usually find that "explicit" is easier to read six months later - and the performance impact is negligible.