LOGIN

<?php
	// MySQL settings
	$host = "localhost"; 		// Host name
	$username = "root"; 		// MySQL username
	$password = ""; 			// MySQL password
	$database_name = "blog"; 	// Datavase bane
	$table_name = "account"; 	// Table name

	// Connection to MySQL
	mysql_connect($host, $username, $password) or die ("Error: " . mysql_error());
	mysql_select_db($database_name) or die ("Error: " . mysql_error());

	// Form information
	$formusername = $_POST["username"];
	$formpassword = $_POST["password"];

	// MySQL injection protection
	$formusername = stripslashes($formusername);
	$formpassword = stripslashes($formpassword);
	$formusername = mysql_real_escape_string($formusername);
	$formpassword = mysql_real_escape_string($formpassword);
	#$formpassword = md5($formpassword);

	// Login
	if ($_SERVER['REQUEST_METHOD'] == "POST") {
		$query = mysql_query("SELECT * FROM $table_name WHERE username='$formusername' and password='$formpassword'");
		$count = mysql_num_rows($query);

		if ($count == 1) {
			// Valid Login
			$_SESSION['login'] = true;
			echo 'Logged in!';
		} else {
			// Unvalid Login
		}
	}
?>

REGISTER

<?php
	// MySQL settings
	$host = "localhost"; 		// Host name
	$username = "root"; 		// MySQL username
	$password = ""; 			// MySQL password
	$database_name = "blog"; 	// Datavase bane
	$table_name = "account"; 	// Table name

	// Connection to MySQL
	mysql_connect($host, $username, $password) or die ("Error: " . mysql_error());
	mysql_select_db($database_name) or die ("Error: " . mysql_error());

	// Form information
	$formusername = $_POST["username"];
	$formpassword1 = $_POST["password1"];
	$formpassword2 = $_POST["password2"];

	// MySQL injection protection + MD5
	$formusername = stripslashes($formusername);
	$formpassword1 = stripslashes($formpassword1);
	$formpassword2 = stripslashes($formpassword2);
	$formusername = mysql_real_escape_string($formusername);
	$formpassword1 = mysql_real_escape_string($formpassword1);
	$formpassword2 = mysql_real_escape_string($formpassword2);
	$formpassword1 = md5($formpassword1);
	$formpassword2 = md5($formpassword2);


	// Register
	if ($_SERVER['REQUEST_METHOD'] == "POST") {
		if (strlen($formpassword1) > 5 and $formpassword1 == $formpassword2) {
			$sql = "INSERT INTO account (username, password) VALUES ('$formusername', '$formpassword1')";
			mysql_query($sql) or die ("Error: " . mysql_error());
			print $formpassword1;
		}
	}
?>