In PHP7 Reserved Word Restrictions was loosen. There are currently 64 keywords reserved by PHP and some of them would be very useful as a method names to user side to define clear API.
Globally reserved words as property, constant, and method names within classes, interfaces, and traits are now allowed. This reduces the surface of BC breaks when new keywords are introduced and avoids naming restrictions on APIs.
This is a list of currently globally reserved words that will become semi-reserved which means we can use as property, constant, and method names within classes, interfaces, and traits.
callable class trait extends implements static abstract final public protected private const enddeclare endfor endforeach endif endwhile and global goto instanceof insteadof interface namespace new or xor try use var exit list clone include include_once throw array print echo require require_once return else elseif default break continue switch yield function if endswitch finally for foreach declare case do while as catch die self parent
The only limitation is that the class keyword still cannot be used as a constant name, otherwise it would conflict with the class name resolution syntax (ClassName::class).
// 'list', 'forEach', and 'for' were previously unusable
class Collection {
public function forEach(callable $callback) { /* */ }
public function list() { /* */ }
public function for() { /* */ }
}
That is it.