My SQLi UPDATE query doesn't seem to be working, I have tried almost everything and I don't know where I am going wrong. I created a similar style PHP but for registering a person (using INSERT) and that worked fine. Here is my UPDATE code:
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
$firstname= $_POST["firstname"];
$surname = $_POST["surname"];
$info= $_POST["info"];
$statement = mysqli_prepare("UPDATE `People` SET `firstname`=? , `surname`=? , `info`=? WHERE `personid`=79 ");
mysqli_stmt_bind_param($statement, "sss", $firstname, $surname, $info);
mysqli_stmt_execute($statement);
mysqli_stmt_close($statement);
mysqli_close($con);
?>