I have a feeling that my syntax is incorrect but I can't narrow down what's going on. I have no issues running the statement in a phpMyAdmin SQL query, so hopefully I can get pointed in the right direction. My code is as follows:
else if ($resultdetails === 1) {
    $query3 = "update customer_det set `10k`='$_10k', 
      `14k`='$_14k', `18k`='$_18k', `21k`='$_21k', `22k`='$_22k', 
      `24k`='$_24k', `925k`='$_925k', `coins`='$coins', `bars`='$bars' 
      where `id` = '".$uid."'";
    $result3 = mysql_query($query3);
}
$resultdetails is a variable set with a EXISTS function.  In the SQL query, it returns 1 for me, because the row I'm looking for does exist. So there should be no issues with that.  
I tried the double ==, as well as the triple, and there doesn't seem to be any difference in results.  I believe the triple === means that it's identical, i.e. the datatype is the same and the value is the same. 
I think the issue here is the WHERE statement. Any ideas or suggestions would be greatly appreciated.  I forgot to mention that customer_det is the table to be updated and id is the primary key, autoincremented. I pull the $uid variable from the database as well.