Question

Let’s say I have a class with 10 methods, each method has different parameters.

I want to log input parameters of all methods of said class without having to do edit each method to insert that logging code. Is there away to do that ?

Answer 1

Just wrap it with decorator with magic __call http://ideone.com/n9ZUD

class TargetClass
{
    public function A($a, $b) {}
    public function B($c, $d) {}
    public function C($e, $f) {}
}

class LoggingDecorator
{
    private $_target;

    public function __construct($target)
    {
        $this->_target = $target;
    }

    public function __call($name, $params)
    {
        $this->_log($name, $params);

        return call_user_func_array(array($this->_target, $name), $params);
    }

    private function _log($name, $params)
    {
        echo $name . ' has been called with params: ' . implode(', ', $params) . '<br>';
    }
}

$target = new TargetClass();
$logger = new LoggingDecorator($target);

$logger->A(1, 2);
$logger->A(3, 4);

The only disadvantage of this approach is that you will lose the type of the decorated class, e.g. you won’t be able to satisfy type hints with it. If that is a concern, distill the interface of TargetClass and implement it in the LoggingDecorator.