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<?php // If this would be for real, decorators would directly replace // the decorated functions/methods. function decorate(callable $fn, array $decorators) { foreach ($decorators as $d) { $wrapper = $d($fn); $fn = $wrapper; } return $wrapper; } function foo($bar) { throw new Exception("Error $bar!"); } function catch_all_exceptions(callable $fn) { return function() use ($fn) { try { return call_user_func_array($fn, func_get_args()); } catch (\Exception $e) { echo "catch_all_exceptions: Caught Exception: $e\n"; } }; } function once(callable $fn) { return function() use ($fn) { static $return; static $called = false; if (!$called) { $return = call_user_func_array($fn, func_get_args()); $called = true; } return $return; }; } function do_something_before(callable $fn) { return function() use ($fn) { echo "Before!\n"; return call_user_func_array($fn, func_get_args()); }; } $bar = decorate(function() { echo "Hello\n"; }, ["once"]); $bar(); $bar(); $bar(); $foo = decorate("foo", ["catch_all_exceptions", "do_something_before"]); var_dump($foo("bar"));

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