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.

范例

Example #1 ReflectionProperty::getDefaultValue() example


<?php
class Foo {
    public $bar = 1;
    public ?int $baz;
    public int $boing = 0;
}

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

以上例程会输出：

int(1)
NULL
int(0)

参见

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

User Contributed Notes

rwalker dot php at gmail dot com 14-Apr-2021 01:49


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;

?>