fix: preg_last_error_msg() can be used in PHP 8.0 or later

Author: kenjis

system/Autoloader/Autoloader.php

@@ -318,7 +318,13 @@ public function sanitizeFilename(string $filename): string
             );
         }
         if ($result === false) {
-            throw new RuntimeException(preg_last_error_msg() . ' filename: "' . $filename . '"');
+            if (version_compare(PHP_VERSION, '8.0.0', '>=')) {
+                $message = preg_last_error_msg();
+            } else {
+                $message = 'Regex error. error code: ' . preg_last_error();
+            }
+
+            throw new RuntimeException($message . '. filename: "' . $filename . '"');
         }
 
         // Clean up our filename edges.

tests/system/Autoloader/AutoloaderTest.php

@@ -226,7 +226,6 @@ public function testSanitizationFilenameEdges()
     public function testSanitizationRegexError()
     {
         $this->expectException(RuntimeException::class);
-        $this->expectExceptionMessage('Malformed UTF-8 characters, possibly incorrectly encoded filename:');
 
         $test = mb_convert_encoding('クラスファイル.php', 'EUC-JP', 'UTF-8');