<?php  
$db_file = "db_file.sqlite"; 

// create database file when not existent yet
if (!file_exists($db_file)) { 
 $db = new PDO('sqlite:' . $db_file); 
 $db->exec("CREATE TABLE registrations(
  id INTEGER PRIMARY KEY AUTOINCREMENT, 
  first_name TEXT,
  last_name TEXT,
  username TEXT,
  note TEXT,
  email TEXT,
  verify_token TEXT,
  request_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"); 
} 
else { 
 // establish connection 
 $db = new PDO('sqlite:' . $db_file);
 $ins_stmt = $db->prepare("INSERT INTO registrations
    (first_name, last_name, note, email, username, verify_token)
    VALUES (:first_name, :last_name, :note, :email, :username, :verify_token);
} 

// set writeable when not set already
if (!is_writable($db_file)) {
 chmod($db_file, 0777); 
} 
?>