MySQL UPDATE Not Updating any row - php

Question

What's wrong with the following syntax:
if( isset($_POST['save_changes']) ) {
// Get current id of customer
$currentID = $_GET['id'];
// Get Input Values
$newfirstName = validateInputData($_POST['first_name']);
$newlastName = validateInputData($_POST['last_name']);
$newemail = validateInputData($_POST['email']);
$newphone = validateInputData($_POST['phone_number']);
$newaddressOne = validateInputData($_POST['address_one']);
$newaddressTwo = validateInputData($_POST['address_two']);
$newcounty = validateInputData($_POST['county']);
$newcity = validateInputData($_POST['city']);
$newzipCode = validateInputData($_POST['zip_code']);
$newprovince = validateInputData($_POST['province']);
$newstate = validateInputData($_POST['state']);
// Queries
$query = "UPDATE customers
SET
first_name='$newfirstName',
last_name='$newlastName',
email='$newemail',
phone='$newphone'
WHERE id='$currentID'
";
$conn->query($query) or die($conn->error.__LINE__);
$query = "UPDATE addresses
SET
address_one='$newaddressOne',
address_two='$newaddressTwo',
county='$newcounty',
city='$newcity',
province='$newprovince',
zip_code='$newzipCode',
state='$newstate'
WHERE customer_id='$currentID'
";
$conn->query($query) or die($conn->error.__LINE__);
// Bring user back to index
header("Location: index.php?alert=savechanges");
// Close connection to database
$conn->close();
}
the above query runs fine, but the row is not updated. all the field names are appropriate. When the query is tried in phpMyAdmin, row updated.
Please help, thank you.

Answer 1

Your validateInputData() function is not doing any validation. Hopefully it's doing some escaping, implying that you are assuming global scope for your database connection object. You didn't tell us what type of database object this is. Your error checking is poor. You don't do an explicit exit after the redirect.
Apart from that the sql looks ok.