PHP - get the last URL segment

php-get-last-url-segment.php

<?php 
	// finds the last URL segment  
	$urlArray = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
	$segments = explode('/', $urlArray);
	$numSegments = count($segments); 
	$currentSegment = $segments[$numSegments - 1];
?>

<?php if ( $currentSegment == "index.php" ) { ?>active<?php } ?>

You can use end($segments);.
https://www.php.net/manual/en/function.end.php