<?php
//We admit that Authors & Articles classes and their tables exist
//Get the article with id 1
$myArticle = Articles::getById(1);
//Check if character is found
if (!empty($myArticle)) {
//Get the new author to link to the article
$myAuthor = Authors::getById(2);
if (!empty($myAuthor)) {
//Update the "author" field of the article
$myArticle->prop('author', $myAuthor);
//And save the changes!
Articles::update($myArticle);
} else {
echo 'The new author of the article is not found.';
}
} else {
echo 'The article to update is not found.';
}