<?php

declare(strict_types=1);

$conn = pg_connect("host='127.0.0.1' dbname='postgres' user='postgres' password='Passw0rd'");

if ($conn === false) {
    die(pg_last_error());
}

// Begin a transaction
pg_query($conn, 'BEGIN');

// Create an empty large object
$oid = pg_lo_create($conn);

if ($oid === false) {
    die(pg_last_error($conn));
}

// Open the large object for writing
$lob = pg_lo_open($conn, $oid, 'w');

if ($oid === false) {
    die(pg_last_error($conn));
}

echo 'The large object has been opened successfully.', PHP_EOL;