Mastering PHP 7

The decorator pattern

The decorator pattern is a simple one. It allows us to add new behavior to object instances without affecting other instances of the same class. It basically acts as a decorating wrapper around our object. We can imagine a simple use case with a Logger class instance, where we have a simple logger class that we would like to occasionally decorate, or wrap into a more specific error, warning, and notice level logger.

The following example demonstrates a possible decorator pattern implementation:

<?phpinterface LoggerInterface{    public function log($message);}class Logger implements LoggerInterface{    public function log($message)    {        file_put_contents('app.log', $message . PHP_EOL, FILE_APPEND);    }}abstract class LoggerDecorator ...