To loop through a record set:
<?php
$db = new SQLite3('auth.sqlite');
$sql = "SELECT user_id, username, opt_status FROM tbl_user";
$result = $db->query($sql);//->fetchArray(SQLITE3_ASSOC);
$row = array();
$i = 0;
while($res = $result->fetchArray(SQLITE3_ASSOC)){
if(!isset($res['user_id'])) continue;
$row[$i]['user_id'] = $res['user_id'];
$row[$i]['username'] = $res['username'];
$row[$i]['opt_status'] = $res['opt_status'];
$i++;
}
print_r($row);
?>