PHP getting the value of a class variable on declaration

Question

I'm just curious if it's possible to get the value of a class variable when making an object of it? What I'd like to do is:

$class = new MyClass("something")->ok;

For the example above, the class is:

class MyClass {
   public $ok;

   public function __construct($a) {
      $this->ok = $a;
   }
}

I know it's easy to get the value of $a by writing one more line, but I'm really curious if it's possible to do in a shorter way.

Amal · Accepted Answer · 2014-06-01 04:36:15Z

2

Yes, it is possible. This feature is known as "Instance method call" and was introduced in PHP 5.4. Just include a pair of extra parentheses wrapping the new MyClass() expression:

$class = (new MyClass("something"))->ok;
         ^                        ^

The expression new MyClass() is what returns the object (as opposed to the class constructor), which is why it requires to be wrapped in an extra pair of parentheses.

2 Comments

Kiss Koppány Over a year ago

So easy and clever solution, thank you! I used Class as the name of the class for example only, but I should've used something else, you're right. :)

Amal Over a year ago

@KissKoppány: Glad to have helped. Cheers!

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