jordan look

<?php
//Set up credentials
$servername = "localhost";
$username = "root";
$password = "";
$database = "users";

// Create connection
$link = mysqli_connect($servername, $username, $password, $database);

 // Check connection
if (!$link) {
    die("Connection failed: " . mysqli_connect_error());
}

//Start query
$username = $_POST['username'];
$password = $_POST['password'];
$sql = "SELECT * FROM userdata WHERE username='$username'";
$result = $link->query($sql);
//Count number of row with that username
$count=mysql_num_rows($result);
//if only one match then...
if($count==1){
	$row = mysql_fetch_assoc($result);
	if(crypt($password,$row['password']) == $row['password']){
	session_register("username");
	session_register("password");
	echo "Login Successful";
	return true;
	}
	else {echo "Wrong username or password";
	return false;
	}
}
else {
	echo "Wrong username or password";
	return false;
}
if ($link->query($sql) === TRUE) {
    echo "","<br>";
} else {
    echo "Error updating record: " . $link->error;
}



$result->close();
$link->close();
?>