Postgres BLOB binary data return error for PHP + HTML

Question

I am running in HTML with PHP an ERP Project that via XAMPP the file Buscacurriculum.php will bring on screen the image and data of the employee.

Mesangem: Fatal error: Uncaught Error: Call to a member function query() on resource "C:\xampp\..." StackTrace: #0 {main}

PHP code

<?php
  $HndCon=pg_connect("host=localhost port=5432 dbname=cyberdynedb user=tst password=minhasenha");
  pg_exec($HndCon,"BEGIN");
  $sql = "SELECT * FROM public.fotos";
  $sth = $HndCon->query($sql);
  $result=pg_fetch_array($sth);
  echo '<img src="data:image/jpeg;base64,'.base64_encode( $result['image'] ).'"/>';
?>

Table photos contains the columns id, foto, oid. There are registered data (1, bynarydata, 33034).

The line $sth = $HndCon->query($sql); i saw in another post here in Stack and helped in the execution but the error persists.