Gets value

# ReflectionProperty::getValue

(PHP 5, PHP 7, PHP 8)

ReflectionProperty::getValue — Gets value

### 说明

public function ReflectionProperty::getValue(?object `$object` = `null`): mixed

Gets the property's value.

### 参数

`object`

  If the property is non-static an object must be provided to fetch the property from. If you want to fetch the default property without providing an object use ReflectionClass::getDefaultProperties() instead.

### 返回值

The current value of the property.

### 更新日志

版本 | 说明
--- | ---
8.1.0 | Private and protected properties can be accessed by ReflectionProperty::getValue() right away. Previously, they needed to be made accessible by calling ReflectionProperty::setAccessible(); otherwise a ReflectionException was thrown.
8.0.0 | `object` is nullable now.

### 示例

示例 #1 ReflectionProperty::getValue() example

    <?php
    class Foo {
        public static $staticProperty = 'foobar';

        public $property = 'barfoo';
        protected $privateProperty = 'foofoo';
    }

    $reflectionClass = new ReflectionClass('Foo');

    var_dump($reflectionClass->getProperty('staticProperty')->getValue());
    var_dump($reflectionClass->getProperty('property')->getValue(new Foo));

    $reflectionProperty = $reflectionClass->getProperty('privateProperty');
    $reflectionProperty->setAccessible(true); // only required prior to PHP 8.1.0
    var_dump($reflectionProperty->getValue(new Foo));
    ?>

以上示例会输出：

    string(6) "foobar"
    string(6) "barfoo"
    string(6) "foofoo"

### 参见

- ReflectionProperty::setValue() - Set property value
- ReflectionProperty::setAccessible() - Set property accessibility
- ReflectionClass::getDefaultProperties() - 获取默认属性
- ReflectionClass::getStaticPropertyValue() - 获取静态（static）属性的值

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