Bug #62156 [Opn->Csd]: Documentation incorrectly states that traits can't define static properties.
Edit report at https://bugs.php.net/bug.php?id=62156&edit=1
ID: 62156
Updated by: requinix@php.net
Reported by: phplists at stanvassilev dot com
Summary: Documentation incorrectly states that traits can't
define static properties.
-Status: Open
+Status: Closed
Type: Bug
Package: Documentation problem
Operating System: -
PHP Version: Irrelevant
-Assigned To:
+Assigned To: requinix
Block user comment: N
Private report: N
Previous Comments:
------------------------------------------------------------------------
[2015-04-15 14:04:40] ppaisndud at gmail dot com
Documentation has been fixed can be closed
------------------------------------------------------------------------
[2012-12-22 21:17:44] guillaumemessier at gmail dot com
Php 5.4 seems to allow the definition of a static variable in a trait. It seems that a static
variable is created for the trait itself and one for each class using the trait.
<?php
trait T {
static public $var = 1;
}
class A {
use T;
}
class B {
use T;
}
var_dump(T::$var);
T::$var = 2;
var_dump(A::$var);
A::$var = 3;
var_dump(B::$var);
B::$var = 4;
var_dump(T::$var);
var_dump(A::$var);
var_dump(B::$var);
?>
Return:
int(1)
int(1)
int(1)
int(2)
int(3)
int(4)
------------------------------------------------------------------------
[2012-05-25 11:45:36] phplists at stanvassilev dot com
Description:
------------
The Traits page at http://us.php.net/manual/en/language.oop5.traits.php
states the
following:
"Static variables can be referred to in trait methods, but cannot be defined by
the trait. Traits can, however, define static methods for the exhibiting class."
This is followed by an example of emulating static properties with function-static
vars.
In testing PHP 5.4 this is wrong, traits support static properties, and they work
as expected...
Test script:
---------------
<?php
trait T {
static public $foo = 123;
}
class C {
use T;
}
echo C::$foo; // 123
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=62156&edit=1
Thread (4 messages)