How to pass a parameter/variable on the initialization of a PHP class?

Question

How do I initialize a PHP class while passing a parameter. Same as PDO that is initialized by passing parameters as data for the database connection.

In my case I just want to pass an ID on startup. Ex:

$user = new User($id);

And after passing the parameter using the Construct function to load all the information of that user, without the need to call some function manually for such action.

Answer 1

Uses a builder:

class User {

   protected $id;
   public $dados;
   public function __construct($id) {
      $this->id = $id; // aqui já tens o teu id
      // echo $this->id; // vai imprimir 4 e podes fazer o que quiseres com ele ao longo dos metodos/atributos desta instância
      // aceder à base de dados, SELECT * FROM users WHERE id = $id, 4 neste caso

      // depois já terás os dados que queres acerca do utilizador
      $this->dados = array('id' => 4, 'nome' => 'Miguel', 'email' => '[email protected]');
   }
}

$u = new User(4);
echo $u->dados['email']; // [email protected]

In this case $dados is just an example of a feedback from the database

DEMONSTRATION