Untitled

<?php

// Processing form data when form is submitted
if (isset($_POST['submit'])){

    include_once 'dbh.inc.php';
    $first = mysqli_real_escape_string($conn, $_POST['first']);
    $pwd = mysqli_real_escape_string($conn, $_POST['pwd']);


    //Errorhanterare
    //kollar efter tomma rutor
    if (emtpy($first)|| empty($pwd)){

    header("Location: ../signup.php?signup=empty");
    exit();

     }else{

      //Kolla om det inskrivna är okej
        if (!preg_match("/^[a-zA-Z]*$/", $first")) || (!preg_match("/^[a-zA-Z]*$/", $pwd")) {

            header("Location: ../signup.php?signup=invalid");
            exit();
        } else {

            if(!filter_var(FILTER_VALID_PWD)){
                header("Location: ../signup.php?signup=pwd");

            }else{
            $sql = "SELECT * FROM users WHERE user_id = '$uid'";
              $result = mysqli_query($conn, $sql);
                $resultCheck = mysql_num_rows($result);

             if($resultCheck > 0){
                    header("Location: ../signup.php?signup=usertaken");
                    exit();

                } else {
                    //hashing password
                    $hashedPwd = password_hash($pwd, PASSWORD_DEFAULT);
                    //insert the user into database
                    $sql = "INSERT INTO users (user_first, user_pwd) VALUES ('$first', '$hashedPwd');";
                    $result = mysql_query($conn, $sql);
                    header("Location: ../signup.php?signup=success");
                    exit();
             }
        }
    }
}


             } else {
                 header("Location: ../signup.php");
                    exit();
}


?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <link   href="CSS/reset.css"
            rel="stylesheet"
            type="text/css">

    <link   href="CSS/main.css"
            rel="stylesheet"
            type="text/css">


</head>
<body style="background-image: url(a.jpg)">

    <ul>
  <li><a class="active" href="index.html">Home</a></li>
  <li><a href="recept.html">Recepies</a></li>
  <li><a href="calender.html">Calender</a></li>
  <li><a href="file_name.php">Log in / Sign up</a></li>
<li><a href="signup.php">Sign in</a></li>
</ul>

	<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
		<div <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
			<label><b>Username:</b>
            <sup>*</sup></label>
			<input type="text" name="username"class="form-control" value="<?php echo $username; ?>">
			<span><?php echo $username_err; ?></span>
		</div>
<div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
			<label><b>Password:</b><sup>*</sup></label>
			<input type="password" name="password" class="form-control">
			<span ><?php echo $password_err; ?></span>
		</div>
		      <div class="form-group">
			 <input type="submit" class="btn btn-primary" value="Submit">
		</div>

	</form>

</body>
</html>