Foreach, special treatment of every n:th item (odd, even for example) [duplicate]

Answer 1

I would look at creating a local variable before the loop, incrementing on each loop iteration, on significant loop iteration perform actions and reset to 0

Answer 2

Create a variable before your foreach called $i and set it to 0;

Inside you foreach use

$class = ($i%4 === 0) ? 'yourclass' : '';

$class is now either 'yourclass' or an empty string

Then at the end of your foreach increment $i with $i++

Answer 3

Use the modulus operator. I see @Alex has beaten me to the mark with this, but I offer this code I wrote and tested, so that others can see more clearly the principle:

$blogusers=array('a','b','c','d','e','f','g','h','i','j');
$i=0;
foreach ($blogusers as $bloguser) {
    if($i % 4 === 0) $extraclass= "fourthClass";
    $resultHTML .= "<div class=\"standardClass $extraclass\">$bloguser</div>";
    $i++;
    $extraclass="";
}
echo $resultHTML;

Could be made more compact with the ternary operator, but this is the principle.

Answer 4

Add counter to it perhaps?

$counter = "";
foreach($array AS $variable){
  $counter +=1;
  // Here you will do your standard stuff you do always
  if($counter == 4){  // check for right counter value
    $counter = "";  // null the counter again
    // HERE you can do stuff that only happens every 4th iteration
  }
  // HERE you can carry on with your usual stuff that happens always
}

Of course there are many different ways to do this, this is in my eyes the simples one.