ReflectionProperty::isInitialized

(PHP 7 >= 7.4.0)

ReflectionProperty::isInitialized — Checks whether a property is initialized

说明

public ReflectionProperty::isInitialized ([ object $object ] ) : bool

Checks whether a property is initialized.

参数

object

If the property is non-static an object must be provided to fetch the property from.

返回值

Returns FALSE for typed properties prior to initialization, and for properties that have been explicitly unset(). For all other properties TRUE will be returned.

错误／异常

Throws a ReflectionException if the property is inaccessible. You can make a protected or private property accessible using ReflectionProperty::setAccessible().

范例

Example #1 ReflectionProperty::isInitialized() example

<?php
class User
{
    public string $name;
}

$rp = new ReflectionProperty('User', 'name');
$user = new User;
var_dump($rp->isInitialized($user));
$user->name = 'Nikita';
var_dump($rp->isInitialized($user));
?>

以上例程会输出：

bool(false)
bool(true)

参见