noptin_parse_post_list( array|string $list )

function noptin_parse_post_list( $list ) {

	// Convert to array.
	$list = noptin_parse_list( $list );

	// Treat numeric values as ids.
	$ids  = array_filter( $list, 'is_numeric' );

	// Assume the rest to be urls.
	$urls = array_diff( $list, $ids );

	// Return an array or ids and urls
	return array(
		'ids'  => array_map( 'absint', $ids ), // convert to integers.
		'urls' => array_map( 'noptin_clean_url', $urls ), // clean the urls.
	);
}