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    ReflectionProperty::setValue

    (PHP 5, PHP 7)

    ReflectionProperty::setValue — Set property value

    설명

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

    Sets (changes) the property's value.

    인수

    object

    If the property is non-static an object must be provided to change the property on. If the property is static this parameter is left out and only value needs to be provided.

    value

    The new value.

    반환값

    값을 반환하지 않습니다.

    오류/예외

    Throws a ReflectionException if the property is inaccessible. You can make a protected or private property accessible using ReflectionProperty::setAccessible().

    예제

    Example #1 ReflectionProperty::setValue() example

    <?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));
    ?>

    위 예제의 출력:

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

    참고

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    User Contributed Notes 3 notes

    up
    2
    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"
    ?>
    up
    2
    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.
    up
    -1
    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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