This article is the sequel to my first drupal
adsense article. This time we're going to put adsense blocks in between
teasers, on for example our frontpage. Same as last time, this does not require
any modules, nor does it depend on adsense, it works with any phptemplate-based
theme and with all sorts of ad code.

For starters, we're going to create a new block
region. If there is not a template.php file in your theme folder, create one
and open it up. See if there is a block
regions function, if there is, add a new
block to it: 'betwteasers' =>
t('between teasers')

If you didn't find a block region function copy this
code into your template.php file (this code should be in between <?php and
?> tags):

function yourtheme_regions() {
return array(
'right' => t('right sidebar'),
'left' => t('left sidebar'),
'content' => t('content'),
'header' => t('header'),
'footer' => t('footer'),
'subnav' => t('subnav'),
'betwteasers' => t('between teasers'),
);
}

Don't forget to substitute yourtheme with the name of your theme!

Now that we have a block region, we're going to need
to place it in our page.tpl.php. Open that file, and look for the code ‘$content',
this variable holds all the teasers on a frontpage, or a full content item on a
node page. What we're going to do now is intercept $content on the frontpages,
explode it into pieces (nodes), then put our adsense code in between some
pieces, and lastly we're putting the whole thing together again.

I'll give the full piece of code first and then I'll explain
how to fit it to your theme:

<?php
if (drupal_is_front_page()){
$arrtv = explode("</div>", $content);
$arrtv[3] = $betwteasers.$arrtv[3];
$arrtv[6] = $betwteasers.$arrtv[6];
$arrtv[9] = $betwteasers.$arrtv[9];
$content = implode("</div>", $arrtv);
print($content);
} else {
print($content);
}
?>

The first line should is obvious, it tests if we are
on a front page. The second line separates all the div elements from each other
and gives us an array. Now comes the tricky part, we need to figure out how
many div tags represents a node. For my custom theme, there were 2 active div
tags in node.tpl.php, so I added an ad block every 2 nodes. The code snippet
above is used with Bluemarine, which has one more div tag in its node.tpl.php.
If your theme is coded to modern web standards (aka semantically) you shouldn't
have more then 2 or 3 div tags in your node template, so you would change the
bolded numbers in the code snippet to either 2-2/4-4/6-6 or maybe 4-4/8-8/12-12.

If you are unlucky enough to use a badly coded theme
you might have work to do still. If the theme uses a table layout you're going
to have to look for another anchor point to stick your ad code to, maybe a
</tr> tag. Garland, I noticed, is also coded badly, its coded suffers
from what we like to call divilitus. That's what happens if you turn your code
into a div
soup. If your themes code is one big div soup you're going to have to play
around with the numbers until it fits, or you're going can count the number of
divs in node.tpl.php and substract the ones that you're are inactive in teaser
view and in your specific website setup. With the latter I refer to how a theme
might use an if-test to check if a piece off code needs to be placed:

    <?php if ($taxonomy): ?>
<div class="terms"><?php print $terms ?></div>
<?php endif;?>

This piece of code checks if you are using taxonomy
and if you don't the taxonomy div element is not placed in your output.

Anyhows, the last step is to add a block with your ad
code in it, and place it in the ‘between teasers' block region. This ad block
will be repeated at every instance where you added the block region to a place
in the array. If you would like to place different ad blocks, you would have to
create multiple block regions and add a different region at every line of the
code snippet for page.tpl.php