Trying to check if username already exists in MySQL database using PHP

Question

I\'ve looked at the many other posts that were similar to my issue and implemented their solutions (as far as I can tell) as exactly as I could. However, every time I execut

Answer 1

Here's one that i wrote:

$error = false;
$sql= "SELECT username FROM users WHERE username = '$username'";
$checkSQL = mysqli_query($db, $checkSQL);

if(mysqli_num_rows($checkSQL) != 0) {
   $error = true;
   echo 'Username taken.';
}

Works like a charm!