Update button

// ... 

if (isset($_POST['update'])) {
	$id = $_POST['id'];
	$name = $_POST['name'];
	$address = $_POST['address'];

	mysqli_query($db, "UPDATE info SET name='$name', address='$address' WHERE id=$id");
	$_SESSION['message'] = "Address updated!"; 
	header('location: index.php');
}

Source: codewithawa.com

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