ReflectionProperty::getDefaultValue

(PHP 8)

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

Descrizione

public function ReflectionProperty::getDefaultValue(): mixed

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

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

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.

Log delle modifiche

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

Esempi

Example #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());
?>

Il precedente esempio visualizzerà:

int(1)
NULL
int(0)
NULL

Vedere anche:

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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