ReflectionProperty::getDefaultValue

(PHP 8)

ReflectionProperty::getDefaultValue — Returns the default value declared for a property

Beschreibung

public function ReflectionProperty::getDefaultValue(): mixed

Gets the implicit or explicitly declared default value for a property.

Parameter-Liste

Diese Funktion besitzt keine Parameter.

Rückgabewerte

The default value if the property has any default value (including null). If there is no default value, then null is returned. It is not possible to differentiate between a null default value and an uninitialized typed property. Use ReflectionProperty::hasDefaultValue() to detect the difference.

Changelog

Version	Beschreibung
8.5.0	Calling ReflectionProperty::getDefaultValue() for properties without default values has been deprecated.

Beispiele

Beispiel #1 ReflectionProperty::getDefaultValue() example

<?php
class Foo {
    public $bar = 1;
    public ?int $baz;
    public int $boing = 0;
    public function __construct(public string $bak = "default") { }
}

$ro = new ReflectionClass(Foo::class);
var_dump($ro->getProperty('bar')->getDefaultValue());
var_dump($ro->getProperty('baz')->getDefaultValue());
var_dump($ro->getProperty('boing')->getDefaultValue());
var_dump($ro->getProperty('bak')->getDefaultValue());
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

int(1)
NULL
int(0)
NULL

Siehe auch

ReflectionProperty::hasDefaultValue() - Checks if property has a default value declared

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User Contributed Notes 1 note

down

rwalker dot php at gmail dot com ¶

5 years ago

An equivalent for PHP 7:

<?php
$reflectionProperty = new \ReflectionProperty(Foo::class, 'bar');

//PHP 8:
$defaultValue = $reflectionProperty->getDefaultValue();

//PHP 7:
$defaultValue = $reflectionProperty->getDeclaringClass()->getDefaultProperties()['bar'] ?? null;
?>

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