ReflectionProperty::getValue

(PHP 5, PHP 7, PHP 8)

ReflectionProperty::getValue — Gets value

说明

public 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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sergiy dot sokolenko at gmail dot com ¶

14 years ago

To allow protected and private properties to be accessed, you should use
ReflectionProperty::setAccessible(bool $accessible):

<?php
/** Class Foo with protected and private members */
class Foo {
    protected $bar = 'barrr!';
    private $baz = 'bazzz!';
}

$reflFoo = new ReflectionClass('Foo');
$reflBar = $reflFoo->getProperty('bar');
$reflBaz = $reflFoo->getProperty('baz');

// Set private and protected members accessible for getValue/setValue
$reflBar->setAccessible(true);
$reflBaz->setAccessible(true);

$foo = new Foo();
echo $reflBar->getValue($foo); // will output "barrr!"
echo $reflBaz->getValue($foo); // will output "bazzz!"

// You can also setValue
$reflBar->setValue($foo, "new value");
echo $reflBar->getValue($foo); // will output "new value"
?>