Question

Within a for loop, i need to add some HTML that outputs only when the loop is on a [(multiple of 3) minus 1].

For example, what i could do is:

for($i=0; $i<count($imagearray); $i++)
{
    if($i=="0" || $i=="2" || $i=="5" || $i=="8" || $i=="11")
    {
        echo 'string';
    }
}

but this isnt very elegant and extremely useless for big for loops, is there a proper way to do this?

Answer 1

if ( $i==0 || ($i+1)%3 == 0 )
{
    //do stuff
}

What this will do, is go to the next index, divide it by 3, and see if there is a remainder. If there is none, then that means that the current index is one less than a number that is divisible by 3