Edit report at https://bugs.php.net/bug.php?id=65843&edit=1
ID: 65843
Updated by: ras...@php.net
Reported by: funnyoz at hotmail dot fr
Summary: Impossibility to assign an object to a property upon
declaration
Status: Open
Type: Feature/Change Request
Package: Class/Object related
Operating System: Ubuntu 13.04
PHP Version: 5.5.4
Block user comment: N
Private report: N
New Comment:
This would force the definition of this class into the executor losing all the
optimizations that go along with being able to fully define classes at
compile-time. The performance impact of this would be significant so I don't
see this happening anytime soon, if ever.
Previous Comments:
------------------------------------------------------------------------
[2013-10-06 10:21:09] funnyoz at hotmail dot fr
Description:
------------
Hello,
This is a very important feature in OOP style, upon declaration, one might need
to assign an object as a default value, this is currently possible for arrays
or primitive types in PHP, but not for objects.
Example :
<?php
class Student {
private $address = AddressFactory::newInstance()->createAddress();
}
?>
The above code respects the best practices of OOP, it even uses the Factory
design pattern, yet in PHP it will fail because it can't be evaluated at
compilation.
Another simple example, say I've created a wrapper class for arrays, in order
to organize the different array functions, the following thing will happen
<?php
class MyClass {
private $array1 = array(); //success
private $array2 = new MyArrayClass(); //failure
}
?>
Instantiating a property in the constructor is not a good practice in object
oriented programming :
<?php
class My Class {
private $array;
public function __construct(MyArrayClass $array) {
$this->array = $array;
//I no longer have an empty constructor, my constructor now have
//parameters, not OOP recommended.
//Many scripts using Reflection API may instantiate
// this class without calling the constructor, hence having a null
$array property.
}
}
?>
This feature is a must in the next generation of PHP. Just think about it.
Test script:
---------------
<?php
class My Class {
private $array = MyArrayClassFactory::createArray(); //hard fail
public function __construct(MyArrayClass $array) {
$this->array = $array;
//I no longer have an empty constructor, my constructor now have
//parameters, not OOP recommended.
//Many scripts using Reflection API may instantiate
// this class without calling the constructor, hence having a null
$array property.
}
}
?>
Expected result:
----------------
Compiler's response : success :-)
Actual result:
--------------
Compiler's response : WTF did you type in line 20 column 12??
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=65843&edit=1
