Re: Traits and "horizontal composition of behavior"

On 05.11.2016 at 15:57, Jeff M wrote: > Hi, everyone. I have a question about traits and composition. On the traits > docs page > <http://php.net/manual/en/language.oop5.traits.php>, it's > described as "horizontal composition of behavior". My question is, does the > word "composition" here mean the same as when the GoF said to "favor > composition over inheritance"? > > More specifically, if I have inheritance: > > class Foo { public function printItem($string) { echo 'Foo: ' . $string > ... PHP_EOL; } public function printPHP() { echo 'PHP is great.' . PHP_EOL; } > } class Bar extends Foo { public function printItem($string) { echo 'Bar: ' > ... $string . PHP_EOL; } } > > And I change it to traits: > > trait Foo { public function printItem($string) { echo 'Foo: ' . $string > ... PHP_EOL; } public function printPHP() { echo 'PHP is great.' . PHP_EOL; } > } class Bar { use Foo; public function printItem($string) { echo 'Bar: ' . > $string . PHP_EOL; } } > > Does that mean I'm "favoring composition"? This mailing is for discussing the PHP documentation. For support questions write to the general user list (<php-general@lists.php.net>), please. -- Christoph M. Becker