如何在PHP 5.3+中的命名空间类中使用全局命名空间类型提示？

Question

namespace MyClass\Util;

class Sample {

  public function each(Object $f) {

  }
}

---

From Calling File (not namespaced)

$sample = new Sample();
$sample->each(new stdClass());

Produces:

Catchable fatal error: Argument 1 passed to MyClass\\Util\\Sample.php must be an instance of MyClass\\Util\\Object, instance of Object given

Answer 1

You can use \\ to point to the global namespace :

namespace MyClass\Util;

class Sample {

  public function each(\Object $f) {

  }
}

As a reference, you can read Global space (quoting) :

Prefixing a name with \\ will specify that the name is required from the global space even in the context of the namespace.