ReflectionClass::getStaticPropertyValue

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

ReflectionClass::getStaticPropertyValue — 获取静态（static）属性的值

说明

public ReflectionClass::getStaticPropertyValue(string $name, mixed &$def_value = ?): mixed

获取这个类里静态（static）属性的值。

参数

name: 静态属性的名称，来返回它的值。
def_value: 假如类没有定义 name 的 static 属性，将返回一个默认值。如果属性不存在，并且省略了此参数，将会抛出 ReflectionException 。

返回值

静态属性的值。

示例

示例 #1 ReflectionClass::getStaticPropertyValue() 的基本用法

<?php
class Apple {
    public static $color = 'Red';
}

$class = new ReflectionClass('Apple');
var_dump($class->getStaticPropertyValue('color'));
?>

以上示例会输出：

string(3) "Red"

参见

ReflectionClass::getStaticProperties() - 获取静态（static）属性
ReflectionClass::setStaticPropertyValue() - 设置静态属性的值

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用户贡献的备注 3 notes

down

Antares ¶

13 years ago

It seems this method has a security level different from the getStaticProperties method.



If you make two classes A and B looking like



<?php

class A{

        protected static $static_var='foo';



        public function getStatic(){

           $class=new ReflectionClass($this);

           return $class->getStaticPropertyValue('static_var');

        }



        public function getStatic2(){

            $class=new ReflectionClass($this);

            $staticProps=$class->getStaticProperties();

            return $staticProps['static_var'];

        }



        public function __construct(){

              echo $this->getStatic2();

              echo $this->getStatic();

        }

}



class B extends A{

        protected static $static_var='foo2';



}

?>



Then the output will be an exception for the getStatic() call, when the getStatic2() will correctly return 'foo2';

down

tracid2008 at atgmail dot com ¶

10 days ago

Note that ReflectionClass::getStaticPropertyValue() can also return values from private or protected properties.

down

-2

Mauro Gabriel Titimoli ¶

14 years ago

If you want to change a static property of a variable class...

PHP 5.2
<?php
$reflection = new ReflectionClass($className);
$staticPropertyReference = & $reflection->getStaticPropertyValue($staticPropertyName);

$staticPropertyReference = 'new value';
?>

PHP 5.3
<?php
$className::$$classProperty
?>