(PHP 7 >= 7.4.0)
ReflectionProperty::isInitialized — Checks whether a property is initialized
public ReflectionProperty::isInitialized ([ object $object ] ) : bool
Checks whether a property is initialized.
object
If the property is non-static an object must be provided to fetch the property from.
Returns false for typed properties prior to initialization, and for properties that have been explicitly unset(). For all other properties true will be returned.
Throws a ReflectionException if the property is inaccessible. You can make a protected or private property accessible using ReflectionProperty::setAccessible().
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));
?> The above example will output:
bool(false) bool(true)
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https://www.php.net/manual/en/reflectionproperty.isinitialized.php