Update mySQL row with PHP using sproc

[Arthur Chan]

New some help to trap and return boolean value on successful or failed update.
The PHP is not returning any values, blank screen, no error messages.

Person ( personId Int, addressL1 varchar(50))
when I update the address I need to return a 1 or -1 value to be displayed in Firefox. The value will be passed onto a Java app.

Here is the PHP:

<?php
header("Content-type:application/json; charset=UTF-8");
$con = mysqli_connect("server", "user", "pwd", "instance");
mysqli_set_charset( $con, "utf8mb4" );
if (mysqli_connect_errno($con)) {
   echo "Failed to connect to MySQL: " .mysqli_connect_error();
   exit();
} 
$personId = $_POST['personId'];
$addressL1= $_POST['addressL1'];
$result = "call sp_updatePerson ('$personId','$AddressL1')";

if($result) {
    return true;
} else {
    return false;
}
mysqli_close($con);
?>

And here is the sproc:

UPDATE Person set addressL1=addressL1
WHERE personId = personId;

In Firefox, I'd execute something like this:
https://forums.mysql.com/updateperson.php?personId=1234&addressL1=123 testing;