__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

phppublic function __isset(string $name): bool

Misol

__isset sehrli metodiga ega klass yaratamiz:

php<?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:

phptrue
false

Misol

Dinamik xususiyatlar bilan ishlash:

php<?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:

phptrue
false

Shuningdek qarang