ReflectionProperty::setValue

(PHP 5, PHP 7, PHP 8)

ReflectionProperty::setValue — Establece el valor de la propiedad

Descripción

public ReflectionProperty::setValue(object $object, mixed $value): void

public ReflectionProperty::setValue(mixed $value): void

Establece (cambia) el valor de la propiedad.

Parámetros

object: Si la propiedad no fuera estática, se deberá proporcionar un objeto sobre el que se cambiará la propiedad. Si la propiedad fuera estática, se omite este parámetro y sólo será necesario completar el value.
value: El nuevo valor.

Valores devueltos

No devuelve ningún valor.

Errores/Excepciones

Lanza ReflectionException si la propiedad no fuera accesible. Si la propiedad fuera de tipo protegido o privado, podrá hacerse accesible mediante ReflectionProperty::setAccessible().

Ejemplos

Ejemplo #1 Ejemplo de ReflectionProperty::setValue()

<?php
class Foo {
    public static $staticProperty;
    
    public $property;
    protected $privateProperty;
}

$reflectionClass = new ReflectionClass('Foo');

$reflectionClass->getProperty('staticProperty')->setValue('foo');
var_dump(Foo::$staticProperty);

$foo = new Foo;

$reflectionClass->getProperty('property')->setValue($foo, 'bar');
var_dump($foo->property);

$reflectionProperty = $reflectionClass->getProperty('privateProperty');
$reflectionProperty->setAccessible(true);
$reflectionProperty->setValue($foo, 'foobar');
var_dump($reflectionProperty->getValue($foo));
?>

El resultado del ejemplo sería:

string(3) "foo"
string(3) "bar"
string(6) "foobar"

Ver también

ReflectionProperty::getValue() - Obtiene el valor
ReflectionProperty::setAccessible() - Hace accesible una propiedad
ReflectionClass::setStaticPropertyValue() - Establece el valor de una propiedad estática

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User Contributed Notes 3 notes

down

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"
?>

down

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.

down

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

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