else statement still runs even when if is true - PHP

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PHP

Okay, so I've got a PHP script that I made that should check to see if a username/email is signed up (This is on a signup page). It stops the MySQL entry from being made, but still runs the final else, even if one of the if/elseif's run.

    $checka = mysqli_query($con,"SELECT id FROM user WHERE user='$user'");

$checkb = mysqli_query($con,"SELECT id FROM user WHERE email='$email'");

$checkc = mysqli_query($con,"SELECT id FROM user WHERE ppage='$string'");


  if (mysql_num_rows($checka) >= 1){

echo 'That username is already in use!';

mysqli_close($con);

}

  elseif (mysql_num_rows($checkb) >= 1){

echo 'That email is already in use!';

mysqli_close($con);

}

  elseif (mysql_num_rows($checkc) >= 1){

echo 'An error occured, please try again!';

mysqli_close($con);


} else {

//This still runs