PHP: How do you determine every Nth iteration of a loop?

Question

I wanted to echo an image every after 3 post via XML here is my code :

Answer 1

every 3 posts?

if($counter % 3 == 0){
    echo IMAGE;
}

Answer 2

The easiest way is to use the modulus division operator.

if ($counter % 3 == 0) {
   echo 'image file';
}

How this works: Modulus division returns the remainder. The remainder is always equal to 0 when you are at an even multiple.

There is one catch: 0 % 3 is equal to 0. This could result in unexpected results if your counter starts at 0.

Answer 3

How about: if(($counter % $display) == 0)

Answer 4

Use the modulo arithmetic operation found here in the PHP manual.

e.g.

$x = 3;

for($i=0; $i<10; $i++)
{
    if($i % $x == 0)
    {
        // display image
    }
}

For a more detailed understanding of modulus calculations, click here.

Answer 5

It will not work for first position so better solution is :

if ($counter != 0 && $counter % 3 == 0) {
   echo 'image file';
}

Check it by yourself. I have tested it for adding class for every 4th element.

Answer 6

I am using this a status update to show a "+" character every 1000 iterations, and it seems to be working good.

if ($ucounter % 1000 == 0) { echo '+'; }