$fileId = 12345; $filePath = getFileByID($fileId); function getFileByID($id) { $pathToFiles = "/path/to/files/"; $pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password"); $stmt = $pdo->prepare("SELECT filepath FROM files WHERE id = :id"); $stmt->bindParam(":id", $id); $stmt->execute(); $result = $stmt->fetch(PDO::FETCH_ASSOC); $filePath = $pathToFiles . $result['filepath']; return $filePath; }This code will retrieve the filepath of the file with an ID of 12345 from the `files` table in the `mydatabase` MySQL database. The filepath will then be concatenated with the `$pathToFiles` variable and returned by the function. Package Library: It is difficult to determine the specific package library that the getByID function belongs to without additional context. However, it is likely that this function would be included in a package or library that handles file management or database access in PHP. Some examples of PHP packages and libraries that may include this function are Laravel, Symfony, or Doctrine.