from flatfile txt to sqlite database login

I had written this hyper-simple login for a web page.

<?php $data= file_get_contents('pass.txt');

session_start();
if (isset($_SESSION['timeout'])) { if ($_SESSION['timeout'] + 20 < time()) { session_destroy(); } }
else { $_SESSION['pass']="" ;  $_SESSION['timeout']=time(); }
if (isset($_POST['pass'])) {$_SESSION['pass']=$_POST['pass'] ; }

if(!empty($_SESSION['pass'])) {
    $line = explode("\n", $data);
    for($i = 0; $i<count($line); $i++) {
        $item = explode("\t", $line[$i]);
        if (password_verify($_SESSION['pass'], $item[0])) {
            echo "Welcome! You're logged in " .$item[1]. "!  <a href='index.php?logout=true'>logout</a>";
            if(isset($_GET['logout'])) {unset($_SESSION['pass']); header('location: index.php');}
        }
    }
}

else {
    echo '<form method="POST" action=""><input type="password" name="pass"><form>';
}

?>

It was based on a txt flatfile like this (password hashed + user list):

$2y$10$WocHepZlhnk7g9VjHIyeEuZgeMNOKq5GDimjyfDK6rSH929mgDJNi    user

I'm now trying to migrate it to sqlite3. But I'm not very good at sqlite coding. Could you help me? Thanks XXX