ReflectionProperty::getDefaultValue

(PHP 8)

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

Description

public function ReflectionProperty::getDefaultValue(): mixed

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

Parameters

This function has no parameters.

Return Values

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

Examples

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());
?>

The above example will output:

int(1)
NULL
int(0)
NULL

See Also

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User Contributed Notes 1 note

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12
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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