Edit report at https://bugs.php.net/bug.php?id=70106&edit=1
ID: 70106
Updated by: bwoebi@php.net
Reported by: soevilcat at mail dot ru
Summary: Inheritance by string, ReflectionClass and anonymous
class
-Status: Open
+Status: Assigned
-Type: Feature/Change Request
+Type: Bug
Package: Reflection related
Operating System: any
-PHP Version: 7.0.0beta1
+PHP Version: 7.0.0beta2
-Assigned To:
+Assigned To: bwoebi
Block user comment: N
Private report: N
New Comment:
You actually can do a workaround via
class_alias(get_class($the_anon_class_instance), "AnonBase");
and then do
new class extends AnonBase { ... }
See also http://3v4l.org/SKWdW
(Assigning to myself as there's a bug when anything in the file path is uppercase)
Previous Comments:
------------------------------------------------------------------------
[2015-07-21 14:34:12] soevilcat at mail dot ru
Description:
------------
Class inheritance is done in runtime, judging from how you can do:
if (rand(0,1)==1) { class Lifeform extends Animal {}; }
else { class Lifeform extends Plant {}; }
You can even make it inherit class features by string by doing eval().
It would be much more convenient to have an official syntax for that, since using eval() has so many
drawbacks - and is impossible with anonymous classes from PHP7 which have no name to reference.
Jbviously they have _some_ internal handle...
Actual use case: a framework designed to be able to run multiple copies of the same extension, but
of different versions, for test purposes or otherwise (let's say, "Game 1.2" and
"Game 1.3"). Files of each are located in different subfolders. The class/namespace
structure would be almost identical, so all the classes are handled anonymously and accessed by
factories or properties (much like can be done in Ruby or JavaScript). Another extension is desined
to operate with "Game" extension - let's say, "SubGame". It was configured
by admin to extend "Game 1.3" classes and not "Game 1.2" classes. Another
"SubGame" instance could be configured to extend "Game 1.2". But for now,
there's no way to inherit an anonymous class... The only solution would be to use tricky
composition to emulate inheritance.
Test script:
---------------
// inheritance by string
class Animal {
public function eat() { echo 'Yummy!'; }
}
class Plant {
public $size=0;
public function grow() { echo 'I\'m level '.++$this->size; }
}
if (rand(0,1)==0) $base='Animal'; else $base='Plant';
class Lifeform extends $base { }
// inheritance by ReflectionClass
$reflection=new ReflectionClass('Animal');
class Predator extends $reflection->getClassEntry() {
public $prey;
}
// inheritance by anonymous class; also requires an object representing the anonymous class, like
Closure is for anonymous functions.
function get_base_animal_class() {
return class extends Animal {
public $color;
public function hiss() { echo 'Hiss!'; }
};
}
$tiger_class=class extends get_base_animal_class() {
public $color='orange';
}
Expected result:
----------------
No errors; valid syntax for inheriting classes.
Actual result:
--------------
Fatal errors: the suggested syntax in currently impossible.
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=70106&edit=1