fixes #2296 include the correct class file depending on the version of php

include/pwgsession.class.php

@@ -0,0 +1,33 @@
+<?php
+// see https://php.watch/versions/8.4/session_set_save_handler-alt-signature-deprecated
+class PwgSession implements SessionHandlerInterface {
+  public function open(string $path, string $name): bool
+  {
+    return pwg_session_open($path, $name);
+  }
+
+  public function close(): bool
+  {
+    return pwg_session_close();
+  }
+
+  public function read(string $id): string
+  {
+    return pwg_session_read($id);
+  }
+
+  public function write(string $id, string $data): bool
+  {
+    return pwg_session_write($id, $data);
+  }
+
+  public function destroy(string $id): bool
+  {
+    return pwg_session_destroy($id);
+  }
+
+  public function gc(int $max_lifetime): int
+  {
+    return pwg_session_gc();
+  }
+}