login.php

<?php include 'includes/head.php' ?>

<?php

if ($_POST){
	$form_data = $_POST;
	print_r( $form_data );
	//do login stuff
} else {
?>

<div class="login">

	<h1>Login</h1>

		<div class="login_form">

			<form name="login" action="login.php" method="POST">
				<label for "username">Username: </label><br />
				<input type="text" name="username"/><br />

				<label for "password">Password: </label><br />
				<input type="password" name="password"/><br />

				<br>

				<button type="submit">Login</button>
			</form>
		</div>

</div>

<?php
$username = $_POST['username'];
$password = $_POST['password'];
$user = 'root';
$pass = '';
$db = new PDO( 'mysql:host=localhost;dbname=users', $user, $pass );
$sql = "SELECT * FROM users WHERE username=:username";

$query = $db->prepare( $sql );
$query->execute( array( ':username'=>$username ) );
$results = $query->fetchAll( PDO::FETCH_ASSOC );

foreach( $results as $row ){
    $password_hash = $row[ 'password' ];
    print_r( $password_hash );
}
}

include 'includes/PasswordHash.php'

?>