__isset metodi
__isset metodi PHP-da sehrli metod hisoblanadi va isset yoki empty funksiyalari yordamida obyekt xususiyatining mavjudligini tekshirishda, bu xususiyat mavjud bo'lmagan yoki kirish mumkin bo'lmaganda chaqiriladi. Metod bitta parametrni qabul qiladi - tekshirilayotgan xususiyat nomi.
Sintaksis
public function __isset(string $name): bool
Misol
__isset sehrli metodiga ega klass yaratamiz:
<?php
class User {
private $data = [
'name' => 'John',
'age' => 30
];
public function __isset($name) {
return isset($this->data[$name]);
}
}
$user = new User();
var_dump(isset($user->name));
var_dump(isset($user->email));
?>
Kodni bajarish natijasi:
true
false
Misol
Dinamik xususiyatlar bilan ishlash:
<?php
class DynamicProperties {
private $storage = [];
public function __isset($name) {
return array_key_exists($name, $this->storage);
}
public function __set($name, $value) {
$this->storage[$name] = $value;
}
}
$obj = new DynamicProperties();
$obj->test = 'value';
var_dump(isset($obj->test));
var_dump(isset($obj->unknown));
?>
Kodni bajarish natijasi:
true
false
