}
// If targeted Folio folder ID and list of local .folio file names are given.
if ($folio_id && $filenames) {
// If this is not the first time uploading, delete existing HTML articles.
if ($status == 'Uploaded') {
// Pull article metadata from designated Folio folder in Folio Producer.
$articles = $fp->articles($folio_id);
$articles = $articles['articles'];
for ($n = 0; $n < count($articles); $n++) {
// If article is HTML base?
if (strstr($articles[$n]['articleMetadata']['tags'], 'DPSBridge')) {
// Delete the article from Folio folder in the Folio Producer.
$fp->deleteArticle($folio_id, $articles[$n]['id']);
} else {
// Reset non-Drupal article's sort number.
$fp->updateArticle($folio_id, $articles[$n]['id'], array('sortOrder' => intval($n)));
}
}
}
// Increment the offset if there is a cover page, for sorting purposes.
if (count($filenames) > 0 && $filenames[0] == 'Cover') {
$offset++;
}
// Increment the offset if there is a TOC page, for sorting purposes.
if (count($filenames) > 1 && $filenames[1] == 'TableofContents') {
$offset++;
}
// Loop through the articles and upload them to the Folio Producer.
for ($i = 0; $i < count($filenames); $i++) {
$adjusted_sort_order = ($i + 1 + $offset) * 1000;
// Checks if the article is not from Drupal.
