loop through every third value in array php

Question

I am sure I am making this way more complicated than it is...

I have an array of values, lets just say they are numbers for now. I want to display them on a page in 3 columns. So I made 3 loops, one for each column. The first loop I want to loop every 3rd value, starting at index 0. The second loop should start at index 1 and do every third. And the third loop should start at index 2 and loop through every third.

This is what I wrote, which seems to work if you only have 3 things in the array, and I'm sure it's overly complicated.

Thanks

 <div class="span4 column">
        <?php for ($i = 0; $i <= count($articles_for_board)/3; $i = $i+2):?>
            stuff in here
            </div>
        <?php endfor; ?>
    </div>
    <div class="span4 column">
        <?php for ($i = 1; $i <= (count($all_boards)/3)+1; $i = $i+2):?>
            stuff in here
            </div>
        <?php endfor; ?>
    </div>
    <div class="span4 column">
        <?php for ($i = 2; $i <= (count($all_boards)/3)+2; $i = $i+2):?>
            stuff in here
            </div>
        <?php endfor; ?>
    </div>

So basically, the first column would hold array index 0, 3, 6... second column would hold 1, 4.. etc third column would hold 2, 5, 8...

THanks

There are too many </div> tags in your code. Is it normal? — Jocelyn
– Jocelyn, Commented Aug 21, 2012 at 1:26
The question is, how do i make a loop that loops through every 3rd element in an array... I'm sure i'm just having a brain fart, but nothhing I'm doing is working — Bill
– Bill, Commented Aug 21, 2012 at 1:29
$i += 3 at the end of the loop is the complete answer. You didn't need to divide the length or add anything to the length in the termination condition. — Dan Grossman
– Dan Grossman, Commented Aug 21, 2012 at 1:30

Waleed Khan · Accepted Answer · 2012-08-21 01:29:04Z

4

With a for-loop, you don't need to worry so much about all that bounds checking. It's a lot simpler than you think it is:

for ($i = 0; $i < count($all_boards); $i += 3)

This loop increments by three every iteration — that is, it gets every third member — and it stops as soon as it exceeds the length of $all_boards.

answered Aug 21, 2012 at 1:29

Waleed Khan

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2 Comments

Dan Grossman Over a year ago

To finish answering the question: start the second loop at $i = 1, and the third with $i = 2, and you have your 3 loops that don't repeat any values.

Bill Over a year ago

Thanks... yea I was thinking too hard about it

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