Added Apache rewrite control, allow dots in URLs, and PHP 8 timers.

.htaccess

@@ -0,0 +1,10 @@
+# Enable rewriting engine
+RewriteEngine On
+
+# Set the base for relative path substitution
+RewriteBase /
+
+# Rewrite requests to index.php if the file or directory doesn't exist
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteRule ^(.*)$ index.php?$1 [L,QSA]

index.php

@@ -17,7 +17,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-if ( empty( $_SERVER['SCRIPT_URI'] ) ) {
+// Discourage direct index file access.
+if ( '/index.php' === $_SERVER['REQUEST_URI'] ) {
 	http_response_code( 503 );
 	exit;
 }
@@ -60,7 +61,7 @@ function retry(): void {
 ) or retry();
 
 $request = preg_replace(
-	'/[^a-z0-9_\/%\-]/',
+	'/[^a-z0-9_\/%\-\.]+/',
 	'',
 	strtolower( substr_replace( $_SERVER['REQUEST_URI'], '', 0, strlen( dirname( $_SERVER['PHP_SELF'] ) ) ) )
 ) ?: 'links';

links.php

@@ -1,6 +1,6 @@
 <?php
 
-$timer = microtime( true );
+$timer = hrtime( true );
 
 header( 'Cache-Control: max-age=3600', true );
 header( 'Pragma: public' );
@@ -256,7 +256,7 @@ function make_alt_link( array $basepoints, string $altendpoint, string $altfor,
 				'Powered by %s &bull; Generated in %s microseconds &bull; Generation ID: <code>%s</code>',
 				[
 					'<a href=https://theseoframework.com/>The SEO Framework</a>',
-					(int) abs( ( microtime( true ) - $timer ) * 1e6 ),
+					(int) abs( ( hrtime( true ) - $timer ) / 1e3 ),
 					bin2hex( random_bytes( 16 ) ),
 				]
 			);