Modify a PHP login script by adding PHP PDO

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We need help for a small project from PHP expert who can handle PHP POD very well. If it goes well, there will be more projects coming.

We got a PHP login script that works very well but we need to add some security features to make it more secure. We want to the script that has following modification:

1. Use PHP PDO to connect mysql database. Please see the example:

try {
$db = new PDO("mysql:host=".DBHOST.";dbname=".DBNAME, DBUSER, DBPASS);
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
}catch (Exception $e){
die('Cannot connect to mySQL server.');

2. Use PHP PDO to interact with mysql database. See the example:

function create_account(){
//Create new account
$sql = 'INSERT into users (username, password, email) VALUES (:username, :password, :email)';
$statement = $this->db->prepare($sql);
$statement->bindParam(':username', $this->user, PDO::PARAM_STR);
$statement->bindParam(':password', $this->pass, PDO::PARAM_STR);
$statement->bindParam(':email', $this->email, PDO::PARAM_STR);
3. After modification, the scrip will be working smoothly.

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