Automatically define page ID & class based on file name and folder structure

functions.php

<?php
// Default Page Title
$page_title	= "Default Page";

// Set relative URL
$url = '/';

// Set $page_id & $page_class
$page_id = $page_class = '';

$urlExplode = explode("/", $url);

$pathName = $_SERVER['SCRIPT_NAME'];
$pathExplode = explode("/", $pathName);

$page_id = explode(".", end($pathExplode));
$page_id = $page_id[0];
$page_class = $page_id;

if (count($pathExplode) == count($urlExplode) && $page_id == "index") {
	$page_id 	= "home";
	$page_class = $page_id;
	
} elseif (count($pathExplode) > count($urlExplode) && $page_id == "index") {
	$sectionNo 	= (count($pathExplode) - 2); 
	$page_id 	= $pathExplode[$sectionNo];
	$page_class = $page_id;

} elseif (count($pathExplode) > count($urlExplode)) {
	$sectionNo 	= (count($pathExplode) - 2); 
	$page_class = $pathExplode[$sectionNo];
}
?>