save pdo execution results into an array? - php

Question

I am using the following to update a table in my db with various values (I have shortened this example to two). Given an array of users ($user_set) I check to see if settings for the user exist... if they do I update the users row... if they do not then I create a row for the user.
The code below works fine, however, I need to return an array of the rows I just changed so I can update the page display with js.
Essentially what I want to do is $result_array[] = $stmt->execute($binding); (all values of the row updated/inserted)
This way I could echo json_encode($result_array); and have an array of all rows I just updated/inserted for use with js.
Is something like this possible or will I need to create the array on my own in php to return?
<?php
//set bindings
$binding = array(
'one' => $settings['one'],
'two' => $settings['two'],
'user_id' => $user['user_id']
);
foreach($user_set as $key)
{
// check if program settings exist or not
$stmt = $db->prepare("SELECT * FROM settings WHERE user_id = ?");
$stmt->execute(array($key['user_id']));
// program_settings result is
$result = $stmt->fetch(PDO::FETCH_ASSOC);
// if result then settings exist and update... if not insert one
if($result)
{
//prepare update statement
$stmt = $db->prepare("UPDATE settings SET one = :one, two = :two WHERE user_id = :user_id");
}
else
{
//prepare insert statement
$stmt = $db->prepare("INSERT INTO settings (user_id, one, two) VALUES (:user_id, :one, :two)");
}
//set comp id
$binding['user_id'] = $key['user_id'];
// execute the update
$stmt->execute($binding);
}
?>

Answer 1

After you use a stmt->execute(); to execute some sql, you can use stmt->fetchAll(); to take all of the rows that has been affected by your sql statement.