ReflectionClass::getDefaultProperties()

(PHP 5, PHP 7)

获取默认属性

说明

获取类的默认属性（包括了继承的属性）。

This method only works for static properties when used on internal classes. The default value of a static class property can not be tracked when using this method on user defined classes.

参数

此函数没有参数。

返回值

默认属性的数组，其键是属性的名称，其值是属性的默认值或者在属性没有默认值时是NULL。这个函数不区分静态和非静态属性，也不考虑可见性修饰符。

范例

Example #1ReflectionClass::getDefaultProperties()例子

以上例程会输出：

array(5) {
   ["staticProperty"]=>
   string(14) "staticProperty"
   ["property"]=>
   string(15) "propertyDefault"
   ["privateProperty"]=>
   string(22) "privatePropertyDefault"
   ["defaultlessProperty"]=>
   NULL
   ["inheritedProperty"]=>
   string(16) "inheritedDefault"
}

参见

• ReflectionClass::getProperties() 获取一组属性
• ReflectionClass::getStaticProperties() 获取静态（static）属性
• ReflectionClass::getProperty() 获取类的一个属性的 ReflectionProperty

runaurufu is not quite right, get_class_vars() does not return protected params, while this one does.
Thus it's extremely useful when having an abstract parent class and protected properties overriding in children.
For example, I use a class factory and one of the children has some static test methods that still need to output a paramether name, like $this->name, etc. With this example code, one can use static::getNotStaticProperty('name'), but not get_class_vars('name').
Try it:
trait static_reflector {
  /*
   * a purely static function that returns default properties of the non-static instance of the same class
   */
  static protected function getNonStaticProperty($key) {
    $me = get_class();
    $reflectionClass = new \ReflectionClass($me);
    $properties_list = $reflectionClass->getDefaultProperties();
    if (isset($properties_list[$key]))
      return $var_name = $properties_list[$key];
    else throw new RuntimeException("BUG: Unable to reflect non-static property '{$key}' from default properties of class {$me}");
  }
}
class a {
  use \static_reflector;
  protected $key_a = 'test ok';
  public static function test() {
    echo static::getNonStaticProperty('key_a')."\n";
    try {
      print static::getNonStaticProperty('key_b');
      echo "FAIL No exception thrown";
    } catch (RuntimeException $e) {
      echo "OK ".$e->getMessage();
    }
  }
}
echo get_class_vars('a')['key_a']; 
a::test();
this will return:
Notice: Undefined index: key_a in ...
test ok
OK BUG: Unable to reflect non-static property 'key_b' from default properties of class a
ps: Yes, this is copied from a unit test.

Worth noting that it will not return private parameters of parent class...
so it works exactly as get_class_vars or get_object_vars

This will return all properties in a class and any parent classes. The array will have keys set to the property names and empty values.

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