mySQL php update - php

Question

How can I update a row in my mySql database from a HTML form. I have tried every technique and nothing seems to work. I would like that users could update their own profile page information.
I have a form on my page but the data doesn't get sent through.
What am i missing?
Here is my code:
------------INDEX.php
<?php
require_once("inc/database.php");
require_once("inc/query.php");
?>
<div class="wrapper">
<div class="content">
<h1>User Profiles</h1>
<?php
while ($row = $results->fetch()) {
$id = ($row["id"]);
$name = ($row["name"]);
$age = ($row["age"]);
$password = ($row["password"]);
print '<div ' . 'class= id-' . ($id) . '">';
print "<p>" . ($name) . "</p>";
print "<p>" . ($password) . "</p>";
print "<p>" . ($age) . "</p>";
print "</div>";
}
?>
</div>
</div>
<form action="inc/addnew.php" method="post">
<p>Name: <input type="text" name="name" required></p>
<p>ID: <input type="text" name="id" value="<?php echo $id; ?>"></p>
<p><input type="submit" value="Lisää"></p>
</form>
------------QUERY.php
<?php
try{
$results = $db->query("SELECT name, password, age, id FROM users");
$results->execute();
// echo "Our query ran successfully.";
} catch (Exception $e){
echo "Data could not be retrived from the database.";
exit;
}
------------DATABASE.php
<?php
try{
$db = new PDO('mysql:host=localhost;dbname=user_profile;port=8889', 'User_profile','bFeLcZjMmVw4PBaF');
$db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$db->exec("SET NAMES 'utf8'");
} catch (Exception $e){
echo "Could not connect to the database.";
exit;
}
------------UPDATE.php
<?php
require_once("database.php");
if( isset( $_POST['name'] ) && strlen( $_POST['id'] )){
$id = $_POST['id'];
$name = $_POST['name'];
$results=("UPDATE users SET name='$name' WHERE id=$id");
}
header("Location: ../index.php");
}
else
{
//error either $_POST['login'] is not set or $_POST['login'] is empty form field
echo 'Name or ID field was empty. Please fill out those fields. Back to site <br>';
}

Answer 1

How you expect this query to execute?
$results=("UPDATE users SET name='$name' WHERE id=$id");
you are just generating a query here on UPDATE.php without actually doing anything with it.
Replace this line with:
$results = $db->query("UPDATE users SET name='$name' WHERE id=$id");

Answer 2

You need to prepare and execute your query, not just define it as a string:
$sth = $db->prepare("UPDATE users SET name=:name WHERE id=:id")
$sth->execute(array("name" => $_POST["name"], "id" => $_POST["id"]));
You should be using placeholders to insert your data. Your query uses string interpolation which is extremely dangerous due to SQL injection bugs. Do not put $_POST data directly into a query, it's never safe.