Doesn't work with coupled classes when used along with autoloading.
For example, in these classes where each class is autoloaded in a separate class file:
Foo.php:
<?php
interface Foo{
public function fx(Bar $bar);
}
?>
Bar2.php:
<?php
class Bar2 implements Foo{
public function fx(Bar2 $bar){
}
}
?>
Bar.php:
<?php
class_alias("Bar2", "Bar");
?>
When used with an autoloader like this:
<?php
spl_autoload_register(function($class){
require($class . ".php");
});
new Bar;
?>
Results in fatal error:
Declaration of Bar2::fx(Bar2 $bar) must be compatible with Foo::fx(Bar $bar) in ~/Bar2.php on line 2
