$groups = array();
$items = preg_split("/\s+/", $src_content[1]);
for ($i=0; $i<count($items); $i=$i+3)
{
  $group = array(
    $items[$i],
    $items[$i+1],
    $items[$i+2],
  );
  $groups[] = $group;
}

echo "<pre>";
print_r($groups);
echo "</pre>";