Tutorial : Let Template.php Eat Static

My arch-nemisis is overly complex logic in template.php and page.tpl.php files. It seems to me that when a drupal codebase becomes brittle and unmaintainable,  the culprit is usually going to be hundreds of conditional lines of php code in a template file. You've probably seen code like this before:

THEMES/SPAGETTI_MONSTER/TEMPLATE.PHP

<?php

function spagetti_monster_page($content) {
// determine weather the page is a node view, or edit
switch(arg(0)) {
case 'node':
if (is_numeric(arg(1)) && (!arg(2) || arg(2) == 'view')) {
$body_class = 'node_view';
}
else if (arg(1) == 'add' || arg(2) == 'edit') {
$body_class = 'node_compose';
}

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Courtesy : nicklewis.org