Are abstract class constructors not implicitly called when a derived class is instantiated?

Question

Take this example:

abstract class Base {     function __construct() {         echo 'Base __construct<br/>';     } }  class Child extends Base {     function __construct() {         echo 'Child __construct<br/>';     } }  $c = new Child();    

Coming from a C# background, I expect the output to be

Base __construct
Child __construct

However, the actual output is just

Child __construct

Answer 1

No, the constructor of the parent class is not called if the child class defines a constructor.

From the constructor of your child class, you have to call the constructor of the parent's class :

parent::__construct(); 

Passing it parameters, if needed.

Generally, you'll do so at the beginning of the constructor of the child class, before any specific code ; which means, in your case, you'd have :

class Child extends Base {     function __construct() {         parent::__construct();         echo 'Child __construct<br/>';     } } 

And, for reference, you can take a look at this page of the PHP manual : Constructors and Destructors -- it states (quoting) :

Note: Parent constructors are not called implicitly if the child class defines a constructor.
In order to run a parent constructor, a call to parent::__construct() within the child constructor is required.