Block visibility for Organic Groups, content types, node uri in one snippet

For some time i have been trying to figure out how to make certain blocks visible within certain og_groups , within certain content types and withing specific nodes.
I have tried og_group_visibility but this did not solve the problem.

So what i did the following :

Insert this in you index.php file after the Drupal Bootstrap

$group = $_SESSION['group'];
$_GET['group']=$group;

Then go to your Block configuration and add the following with the PHP option selected:

<?php
$match = FALSE;
// Insert Content types here
$types = array(
               'forum' => 1,
               'for_sale'=>1,
               );

// Insert URLS here
$uris = array(
           '/forums' => 1,
           '/marketplace' =>1,
           '/business-listing/284/29/&gid=284'=>1,
             );

//Do not Edit
$group = $_GET['group'];
  
// Insert Group ID here
         if($group=='284' 
         OR $group=='90'
) {
// Do not Edit Below
if ((arg(0) == 'node') && is_numeric(arg(1))) {
     $node = node_load(arg(1));
     $match = isset($types[$node->type]);
}

$match |= isset($uris[request_uri()]);
}

return $match;
?>

Hope this helps anybody. This will be particularly useful if you have advertisements to display in blocks you have to play around with visibility.