ReflectionProperty::getDefaultValue

(PHP 8)

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

说明

public ReflectionProperty::getDefaultValue(): mixed

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

参数

此函数没有参数。

返回值

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 unitialized typed property. Use ReflectionProperty::hasDefaultValue() to detect the difference.

示例

示例 #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());
?>

以上示例会输出：

int(1)
NULL
int(0)
NULL

参见

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rwalker dot php at gmail dot com
3 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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备份地址：http://www.lvesu.com/blog/php/reflectionproperty.getdefaultvalue.php