有什么方法可以使用反射类来设置私有/受保护的静态属性? [英] Is there any way to set a private/protected static property using reflection classes?
问题描述
我正在尝试为类的静态属性执行备份/恢复功能.我可以使用反射对象getStaticProperties()
方法获取所有静态属性及其值的列表.这将同时获取private
和public static
属性及其值.
I am trying to perform a backup/restore function for static properties of classes. I can get a list of all of the static properties and their values using the reflection objects getStaticProperties()
method. This gets both private
and public static
properties and their values.
问题是,当尝试使用反射对象setStaticPropertyValue($key, $value)
方法还原属性时,我似乎没有得到相同的结果. private
和protected
变量与getStaticProperties()
一样,在此方法中不可见.似乎不一致.
The problem is I do not seem to get the same result when trying to restore the properties with the reflection objects setStaticPropertyValue($key, $value)
method. private
and protected
variables are not visible to this method as they are to getStaticProperties()
. Seems inconsistent.
是否有使用反射类来设置私有/受保护的静态属性的方法,或者其他任何方式?
Is there any way to set a private/protected static property using reflection classes, or any other way for that matter?
尝试
class Foo {
static public $test1 = 1;
static protected $test2 = 2;
public function test () {
echo self::$test1 . '<br>';
echo self::$test2 . '<br><br>';
}
public function change () {
self::$test1 = 3;
self::$test2 = 4;
}
}
$test = new foo();
$test->test();
// Backup
$test2 = new ReflectionObject($test);
$backup = $test2->getStaticProperties();
$test->change();
// Restore
foreach ($backup as $key => $value) {
$property = $test2->getProperty($key);
$property->setAccessible(true);
$test2->setStaticPropertyValue($key, $value);
}
$test->test();
推荐答案
要访问类的私有/受保护属性,我们可能需要首先使用反射来设置该类的可访问性.尝试以下代码:
For accessing private/protected properties of a class we may need to set the accessibility of that class first, using reflection. Try the following code:
$obj = new ClassName();
$refObject = new ReflectionObject( $obj );
$refProperty = $refObject->getProperty( 'property' );
$refProperty->setAccessible( true );
$refProperty->setValue(null, 'new value');
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