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Request #65750 Enabling factory constructors
Submitted: 2013-09-24 08:40 UTC Modified: -
From: thomas dot sahlin at invented dot se Assigned:
Status: Open Package: *General Issues
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2013-09-24 08:40 UTC] thomas dot sahlin at invented dot se
Description:
------------
It would be nice to be able to create factory constructors (like Dart offers). 
This could be achieved by allowing __construct to return an arbitrary object of 
the same class or a descendant thereof.

No return statement would then mean "return $this;" as it is today.

Sure, one can use a static factory method, but it's not as elegant and cannot 
simply be added to existing code without modifying all places where objects are 
instantiated.

Test script:
---------------
class MyClass
{
  public function __construct($id)
  {
    if (isset(self::$cache[$id]))
      return self::$cache[$id];

    // Do expensive setup

    self::$cache[$id] = $this;
  }

  private static $cache = array();
}


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