[PHP] To check for existing user in database

[Chris Carter]

Hi,

I know this is very basic question, this is so because I am a basic
programmer struggling to make things work.

Where in this code should I be trying to check if the user already exists
and throw an error saying "The user already exists ding ding ding". The
check has to be done with the emailAddress:

<?
   
   // database information
   $host = 'xxx';      
   $user = 'xxx';
   $password = 'xxx';
   $dbName = 'xxx';

    if ($_POST['submit']) {

   // connect and select the database
                $conn = mysql_connect($host, $user, $password) or 
die(mysql_error());
                $db = mysql_select_db($dbName, $conn) or die(mysql_error());

   // insert new entry in the database if entry submitted

          $emailAddress = $_POST['emailAddress'];
          $confEmail = $_POST['confEmail'];
          $password = $_POST['password'];
          $confPassword = $_POST['confPassword'];
                  
               $body = "Some email text";
                
      // insert new entry into database
      $sql = "insert into `owners` (emailAddress, confEmail, password,
confPassword) VALUES ('$emailAddress', '$confEmail', '$password',
'$confPassword')";
   
          if(mysql_query($sql))
                    {
                          mail($emailAddress, "Thank you for registering!", 
$body, "From:
some...@someone.com");
                          header("Location: thankYou.php");
                        } 
                        else 
                        {
                        die("Error! Could not insert values".mysql_error()); 
                        }
                }
 ?>

Thanks in advance,

Chris
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