<?php
pg_connect("host=192.168.56.101 port=5432 dbname=siprocesos user=postgres password=123456");
$consulta = "select itemname from basicos.auth_asignacion where userid=$data->id";
$resultado = pg_query($consulta) or die( "Error en $consulta: " . pg_last_error());
while($datos = pg_fetch_array($resultado)){

     $rol= $datos['itemname'];
}

?>