ReflectionProperty::hasDefaultValue
(PHP 8)
ReflectionProperty::hasDefaultValue — Checks if property has a default value declared
说明
public ReflectionProperty::hasDefaultValue(): bool
Checks whether the property was declared with a default value, including an implicit
null default value. Only returns false for typed properties without default value (or
dynamic properties).
参数
此函数没有参数。
返回值
If the property has any default value (including null) true is returned;
if the property is typed without a default value declared or is a dynamic property, false is returned.
范例
示例 #1 ReflectionProperty::hasDefaultValue() example
<?php
class Foo {
public $bar;
public ?int $baz;
public ?int $foo = null;
public int $boing;
public function __construct()
{
$this->ping = '';
}
}
$ro = new ReflectionObject(new Foo());
var_dump($ro->getProperty('bar')->hasDefaultValue());
var_dump($ro->getProperty('baz')->hasDefaultValue());
var_dump($ro->getProperty('foo')->hasDefaultValue());
var_dump($ro->getProperty('boing')->hasDefaultValue());
var_dump($ro->getProperty('ping')->hasDefaultValue()); // Dynamic property
var_dump($ro->getProperty('pong')->hasDefaultValue()); // Not defined property
?>
以上例程会输出：
bool(true) bool(false) bool(true) bool(false) bool(false) Fatal error: Uncaught ReflectionException: Property Foo::$pong does not exist in example.php
add a note
User Contributed Notes
There are no user contributed notes for this page.
备份地址：http://www.lvesu.com/blog/php/reflectionproperty.hasdefaultvalue.php