Question

How to do something every 5 (for example) cycles inside foreach?

I’m add $i++ How to check it by step?

Answer 1

Use modulo to determine offset.

$i = 0;

foreach ($array as $a) {
   $i++;
   if ($i % 5 == 0) {
       // your code for every 5th item
   }

   // your inside loop code
}