ReflectionClass::getDefaultProperties

(PHP 5, PHP 7, PHP 8)

ReflectionClass::getDefaultProperties — 获取默认属性

说明

public ReflectionClass::getDefaultProperties(): array

获取类的默认属性（包括了继承的属性）。

注意:

当在内部类中使用时，此方法仅用于静态属性，当在用户定义类中使用此方法时，无法追踪静态类属性的默认值。

参数

此函数没有参数。

返回值

默认属性的 array，其键是属性的名称，其值是属性的默认值或者 null（如果没有默认值）。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。

示例

示例 #1 ReflectionClass::getDefaultProperties() 示例

<?php
class Bar {
protected $inheritedProperty = 'inheritedDefault';
}

class Foo extends Bar {
public $property = 'propertyDefault';
private $privateProperty = 'privatePropertyDefault';
public static $staticProperty = 'staticProperty';
public $defaultlessProperty;
}

$reflectionClass = new ReflectionClass('Foo');
var_dump($reflectionClass->getDefaultProperties());
?>

以上示例会输出：

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

参见

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用户贡献的备注 2 notes

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4
articice at ua dot fm
8 years ago
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.
up
2
runaurufu AT gmail.com
13 years ago
Worth noting that it will not return private parameters of parent class...
so it works exactly as get_class_vars or get_object_vars
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备份地址：http://www.lvesu.com/blog/php/reflectionclass.getdefaultproperties.php