PHP - Connect to a database changing the effective user

From Ingres Community Wiki

<?php

$database='dbname';
$user='user';
$password='password';


$options = array( "effective_user" => "ingres");

$conn=ingres_connect($database,$user,$password, $options);

if ( ingres_errno($conn) ) {
    $error_code=ingres_errno();
    $error_text=ingres_error();
    $error_sqlstate=ingres_errsqlstate();
    printf ( "Error during connect : %s\n\r",$error_code);
    printf ( "Error during connect : %s\n\r", $error_text);
    printf ( "Error during connect : %s\n\r", $error_sqlstate);
    die("i died");
} 
else
{
    echo "Connection succeeded.";
}
$rc=ingres_query($conn,"select dbmsinfo('system_user') as system_user, dbmsinfo('username') as username");

if ( ingres_errno() ) {
    $error_code=ingres_errno($conn);
    $error_text=ingres_error($conn);
    $error_sqlstate=ingres_errsqlstate($conn);
    printf ( "Error during query : %s\n\r",$error_code);
    printf ( "Error during query : %s\n\r", $error_text);
    printf ( "Error during query : %s\n\r", $error_sqlstate);
    die("i died");
} 
else
{
    $object = ingres_fetch_object ($rc);
    echo "The user " . $object->system_user . " is impersonating ". $object->username .".";
}

ingres_close($conn);
?>

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