Invalidate cache upon update

index.php

@@ -29,6 +29,15 @@
 error_reporting(E_ERROR | E_WARNING | E_PARSE);
 ini_set("display_errors", 1);
 
+if(isset($_GET['invalidateCache'])) {
+    header("Expires: Tue, 01 Jan 2000 00:00:00 GMT");
+    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
+    header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
+    header("Cache-Control: post-check=0, pre-check=0", false);
+    header("Pragma: no-cache");
+    header("Location: ./");
+}
+
 $platformList = ["PS5", "PS4", "XSX", "XB1", "Switch", "PC", "Android", "PSVR2", "iOS"];
 sort($platformList);
 

php/update.php

@@ -74,9 +74,7 @@
                 print("
                     <div>
                         Success! This installation of GameHorizon has been updated to <a href='https://github.com/xdpirate/gamehorizon/commit/$commitHash' target='_blank'><b><code>$commitHash</code></b></a>.<br /><br />
-                        To avoid errors from stale cache entries in your browser, it's a good idea to clear the cache once you exit the updater. You can do this by pressing Ctrl+F5, or by holding down Shift, then clicking the Refresh button in your browser toolbar with the cursor.<br /><br />
-                        <a href='https://github.com/xdpirate/gamehorizon/commits/main' target='_blank'>See commit history</a><br /><br />
-                        <input type='button' value='Return to GameHorizon' onclick='window.location.href=\".\";'>
+                        <a href='https://github.com/xdpirate/gamehorizon/commits/main' target='_blank'>See commit history</a> (opens in a new tab) or <input type='button' value='Return to GameHorizon' onclick='window.location.href='./?invalidateCache';'>
                     </div>
                 ");
             }