ReflectionProperty::setValue
(PHP 5, PHP 7, PHP 8)
ReflectionProperty::setValue — Set property value
说明
Sets (changes) the property's value.
注意: As of PHP 8.3.0, calling this method with a single argument is deprecated, use ReflectionClass::setStaticPropertyValue() instead.
参数
object
-
If the property is non-static an object must be provided to change the property on. If the property is static a value of
null
must be to be provided. value
-
The new value.
返回值
没有返回值。
更新日志
版本 | 说明 |
---|---|
8.3.0 | Calling this method with a single argument is deprecated, ReflectionClass::setStaticPropertyValue() should be used instead to modify static properties. |
8.1.0 | Private and protected properties can be accessed by ReflectionProperty::setValue() right away. Previously, they needed to be made accessible by calling ReflectionProperty::setAccessible(); otherwise a ReflectionException was thrown. |
示例
示例 #1 ReflectionProperty::setValue() example
<?php
class Foo {
public static $staticProperty;
public $property;
protected $privateProperty;
}
$reflectionClass = new ReflectionClass('Foo');
// As of PHP 8.3, setValue should no longer be used to set static property value, use setStaticPropertyValue() instead
$reflectionClass->setStaticPropertyValue('staticProperty', 'foo');
var_dump(Foo::$staticProperty);
$foo = new Foo;
$reflectionClass->getProperty('property')->setValue($foo, 'bar');
var_dump($foo->property);
$reflectionProperty = $reflectionClass->getProperty('privateProperty');
$reflectionProperty->setAccessible(true); // only required prior to PHP 8.1.0
$reflectionProperty->setValue($foo, 'foobar');
var_dump($reflectionProperty->getValue($foo));
?>
以上示例会输出:
string(3) "foo" string(3) "bar" string(6) "foobar"
参见
- ReflectionProperty::getValue() - Gets value
- ReflectionProperty::setAccessible() - Set property accessibility
- ReflectionClass::setStaticPropertyValue() - 设置静态属性的值
+添加备注
用户贡献的备注 3 notes
me at ircmaxell dot om ¶
13 years ago
You can use ReflectionProperty::setValue to set the value on static properties as well as regular instance properties. Simply pass null in place of the instance:
<?php
class Foo {
protected static $bar = null;
public static function sayBar() {
echo self::$bar;
}
}
$r = new ReflectionProperty('Foo', 'bar');
$r->setAccessible(true);
$r->setValue(null, 'foo');
Foo::sayBar(); // "foo"
?>
p stewart imperial ac uk ¶
2 years ago
setValue can be used for readonly properties, but only if the property has not yet been initialised:
<?php
class Person
{
private readonly int $age;
public function __construct(array $props = []) {
if (isset($props['age'])) {
$this->age = (int)$props['age'];
}
}
}
$personWithKnownAge = new Person(['age' => 50]);
$reflection = new ReflectionProperty($personWithKnownAge, 'age');
$reflection->setValue($personWithKnownAge, 10); // Fails - Age is already initialised, value cannot be changed.
$personWithUnknownAge = new Person();
$reflection = new ReflectionProperty($personWithUnknownAge, 'age');
$reflection->setValue($personWithUnknownAge, 10); // Succeeeds - Age is not yet initialised, value can be set.
?>
This can be useful for situations where it is desirable to initialise properties from outside of the defining class, for example an ORM setup where the parent class is responsible for setting properties on a model subclass instance.
temirkhan.nasukhov ¶
2 years ago
Keep in mind that setValue won't work for readonly properties.
<?php
class Person
{
public function __construct(private readonly int $age) {}
}
$someOldPerson = new Person(80);
$reflection = new ReflectionProperty($someOldPerson, 'age');
$reflection->setValue($someOldPerson, 10); // Fatal error: Uncaught Error: Cannot modify readonly property Person::$age
备份地址:http://www.lvesu.com/blog/php/reflectionproperty.setvalue.php