在PHP中定义公共类变量的最佳方法

Question

Is there any difference between these methods of declaring and setting a public class variable? Is there any reason why you would choose one over the other?

Method 1

class example {

  public $myArray;

  function __construct() {
    $this->myArray = array(1, 2, 3);
  }

  function showVar() {
    print_r( $this->myArray );
  }

}

Method 2

class example {

  public $myArray = array(1, 2, 3);

  function showVar() {
    print_r( $this->myArray );
  }

}

Answer 1

In first case the code will be evaluated each time you create new class instance.

In second case - it will be evaluated just once when class was parsed.

That's all.