diff --git a/Crawler.php b/Crawler.php
index 8fb777e..e8d4ccb 100644
--- a/Crawler.php
+++ b/Crawler.php
@@ -4,7 +4,6 @@ namespace dokuwiki\plugin\filelist;
 
 class Crawler
 {
-
     /** @var string regexp to check extensions */
     protected $ext;
 
diff --git a/Path.php b/Path.php
index 01c85a3..82944dc 100644
--- a/Path.php
+++ b/Path.php
@@ -46,7 +46,7 @@ class Path
                 // this is an alias for the last read root
                 $line = trim(substr($line, 2));
                 if (!isset($paths[$lastRoot])) continue; // no last root, no alias
-                $alias = $this->cleanPath($line);
+                $alias = static::cleanPath($line);
                 $paths[$lastRoot]['alias'] = $alias;
                 $paths[$alias] = &$paths[$lastRoot]; // alias references the original
             } elseif (str_starts_with($line, 'W>')) {
@@ -56,11 +56,11 @@ class Path
                 $paths[$lastRoot]['web'] = $line;
             } else {
                 // this is a new path
-                $line = $this->cleanPath($line);
+                $line = static::cleanPath($line);
                 $lastRoot = $line;
                 $paths[$line] = [
                     'root' => $line,
-                    'web' => DOKU_BASE . 'lib/plugins/filelist/file.php?root=' . rawurlencode($line).'&file=',
+                    'web' => DOKU_BASE . 'lib/plugins/filelist/file.php?root=' . rawurlencode($line) . '&file=',
                 ];
             }
         }
@@ -78,13 +78,11 @@ class Path
      */
     public function getPathInfo($path, $addTrailingSlash = true)
     {
-        $path = $this->cleanPath($path, $addTrailingSlash);
+        $path = static::cleanPath($path, $addTrailingSlash);
 
         $paths = $this->paths;
         $allowed = array_keys($paths);
-        usort($allowed, function ($a, $b) {
-            return strlen($a) - strlen($b);
-        });
+        usort($allowed, static fn($a, $b) => strlen($a) - strlen($b));
         $allowed = array_map('preg_quote_cb', $allowed);
         $regex = '/^(' . implode('|', $allowed) . ')/';
 
diff --git a/file.php b/file.php
index e89049b..e3f5b9d 100644
--- a/file.php
+++ b/file.php
@@ -1,5 +1,7 @@
 <?php
 
+// phpcs:disable PSR1.Files.SideEffects.FoundWithSymbols
+
 use dokuwiki\plugin\filelist\Path;
 
 if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/../../../');
@@ -37,4 +39,3 @@ try {
     echo $e->getMessage();
     exit;
 }
-
diff --git a/syntax.php b/syntax.php
index efd95da..86c2733 100644
--- a/syntax.php
+++ b/syntax.php
@@ -88,7 +88,7 @@ class syntax_plugin_filelist extends SyntaxPlugin
         $path = Path::cleanPath($path, false);
         $parts = explode('/', $path);
         $pattern = array_pop($parts);
-        $base = join('/', $parts) . '/';
+        $base = implode('/', $parts) . '/';
 
         return [$base, $pattern, $params];
     }
@@ -121,7 +121,14 @@ class syntax_plugin_filelist extends SyntaxPlugin
         $crawler = new Crawler($this->getConf('extensions'));
         $crawler->setSortBy($params['sort']);
         $crawler->setSortReverse($params['order'] === 'desc');
-        $result = $crawler->crawl($pathInfo['root'], $pathInfo['local'], $pattern, $params['recursive'], $params['titlefile']);
+
+        $result = $crawler->crawl(
+            $pathInfo['root'],
+            $pathInfo['local'],
+            $pattern,
+            $params['recursive'],
+            $params['titlefile']
+        );
 
         // if we got nothing back, display a message
         if ($result == []) {
@@ -139,10 +146,7 @@ class syntax_plugin_filelist extends SyntaxPlugin
             case 'table':
                 $output->renderAsTable($params);
                 break;
-
         }
         return true;
-
     }
-
 }