diff --git a/src/_h5ai/server/php/inc/class-item.php b/src/_h5ai/server/php/inc/class-item.php
index 69cbf9ea..8245d764 100644
--- a/src/_h5ai/server/php/inc/class-item.php
+++ b/src/_h5ai/server/php/inc/class-item.php
@@ -15,68 +15,6 @@ class Item {
     }
 
 
-    private static $size_cache = array();
-
-
-    private static function filesize($app, $path) {
-
-        if (array_key_exists($path, Item::$size_cache)) {
-            return Item::$size_cache[$path];
-        }
-
-        $size = null;
-
-        if (is_file($path)) {
-
-            if (PHP_INT_SIZE < 8) {
-                $_handle = fopen($path, "r");
-
-                $_pos = 0;
-                $_size = 1073741824;
-                fseek($_handle, 0, SEEK_SET);
-                while ($_size > 1) {
-                    fseek($_handle, $_size, SEEK_CUR);
-
-                    if (fgetc($_handle) === false) {
-                        fseek($_handle, -$_size, SEEK_CUR);
-                        $_size = (int)($_size / 2);
-                    } else {
-                        fseek($_handle, -1, SEEK_CUR);
-                        $_pos += $_size;
-                    }
-                }
-
-                while (fgetc($_handle) !== false) {
-                    $_pos++;
-                }
-                fclose($_handle);
-
-                $size = $_pos;
-            } else {
-                $size = @filesize($path);
-            }
-
-        } else if (is_dir($path)) {
-
-            $options = $app->get_options();
-            if ($options["foldersize"]["enabled"]) {
-                if (HAS_CMD_DU && $options["foldersize"]["type"] === "shell-du") {
-                    $cmdv = array("du", "-sk", $path);
-                    $size = intval(preg_replace("#\s.*$#", "", Util::exec_cmdv($cmdv)), 10) * 1024;
-                } else {
-                    $size = 0;
-                    foreach ($app->read_dir($path) as $name) {
-                        $size += Item::filesize($app, $path . "/" . $name);
-                    }
-                }
-            }
-        }
-
-        Item::$size_cache[$path] = $size;
-        return $size;
-    }
-
-
     public static function get($app, $path, &$cache) {
 
         if (!Util::starts_with($path, ROOT_PATH)) {
@@ -111,7 +49,7 @@ class Item {
         $this->is_folder = is_dir($this->path);
         $this->url = $app->to_url($this->path, $this->is_folder);
         $this->date = @filemtime($this->path);
-        $this->size = Item::filesize($app, $this->path);
+        $this->size = Util::filesize($app, $this->path);
         $this->is_content_fetched = false;
 
         // $options = $app->get_options();
diff --git a/src/_h5ai/server/php/inc/class-util.php b/src/_h5ai/server/php/inc/class-util.php
index adece248..8e523dfd 100644
--- a/src/_h5ai/server/php/inc/class-util.php
+++ b/src/_h5ai/server/php/inc/class-util.php
@@ -114,4 +114,65 @@ class Util {
         } catch (Exception $e) {}
         return false;
     }
+
+
+    private static $size_cache = array();
+
+    public static function filesize($app, $path) {
+
+        if (array_key_exists($path, Util::$size_cache)) {
+            return Util::$size_cache[$path];
+        }
+
+        $size = null;
+
+        if (is_file($path)) {
+
+            if (PHP_INT_SIZE < 8) {
+                $_handle = fopen($path, "r");
+
+                $_pos = 0;
+                $_size = 1073741824;
+                fseek($_handle, 0, SEEK_SET);
+                while ($_size > 1) {
+                    fseek($_handle, $_size, SEEK_CUR);
+
+                    if (fgetc($_handle) === false) {
+                        fseek($_handle, -$_size, SEEK_CUR);
+                        $_size = (int)($_size / 2);
+                    } else {
+                        fseek($_handle, -1, SEEK_CUR);
+                        $_pos += $_size;
+                    }
+                }
+
+                while (fgetc($_handle) !== false) {
+                    $_pos++;
+                }
+                fclose($_handle);
+
+                $size = $_pos;
+            } else {
+                $size = @filesize($path);
+            }
+
+        } else if (is_dir($path)) {
+
+            $options = $app->get_options();
+            if ($options["foldersize"]["enabled"]) {
+                if (HAS_CMD_DU && $options["foldersize"]["type"] === "shell-du") {
+                    $cmdv = array("du", "-sk", $path);
+                    $size = intval(preg_replace("#\s.*$#", "", Util::exec_cmdv($cmdv)), 10) * 1024;
+                } else {
+                    $size = 0;
+                    foreach ($app->read_dir($path) as $name) {
+                        $size += Util::filesize($app, $path . "/" . $name);
+                    }
+                }
+            }
+        }
+
+        Util::$size_cache[$path] = $size;
+        return $size;
+    }
 }