PHP echo break tag - php

Question

In my PHP script, there are 3 echo, based on the conditionals
echo "Error"
echo "User already existed"
echo "Success"
One of the echo will be passed to my android apps, if (s.equals("Success")), where s is the echo message.
But the echo I got when the registration success is <br />, according to the logcat. For User already existed have no problem.
Since s is not Success, I can't start another activity which is depended on the string. Can anyone explain how the break tag got echoed? The registration information successfully inserted into database, though.
elseif ($roleID == "C") {
$sql6 = "SELECT runnerID FROM tr_customer WHERE customerID = '$newID'";
$check4 = mysqli_fetch_array(mysqli_query($con,$sql6));
if(!isset($check4)) {
// add into db
$customerID = $roleID . $newID;
$sql7 = "INSERT INTO tr_customer(customerID, name, phoneNo, locationID, roleID, email) VALUES ('$customerID', '$name', '$phoneNo', '$locationID', '$roleID', '$email')";
if(mysqli_query($con,$sql7)) {
echo "Success";
}
} else {
$newID = checkExist();
}

Answer 1

I would examine the code where the variable is defined. If you could post that part of the code as an edit then perhaps someone can review it for you as well. There is just not enough information here to discern where your error is coming from.
EDIT:
Consider changing the way you check for a successful update.
$result = mysqli_query($con,$sql7);
if(mysqli_num_rows($result) == 1){
echo "Success";
}