#47765 [Bgs]: __invoke lacks if object is a static property or return
ID: 47765
User updated by: biohazard999 at gmx dot at
Reported By: biohazard999 at gmx dot at
Status: Bogus
Bug Type: Documentation problem
Operating System: *
PHP Version: 5.3.0RC1
New Comment:
There is no method called "f". I'm talking about a static member
variable.
So you can't invoke a static member variable as function.
There is NO hint in the documentation you can't call a object thats
returned by a method or holden in a static member var as a function.
Check the docs:
The __invoke method is called when a script tries to call an object as
a function.
$anObject(); //calls: __invoke
$this->anObject(); //calls: __invoke
AClass::$anObject(); //throws: Fatal error?! there is no static member
"anObject".
AClass::methodReturningAnObject()() //should: call the __invoke
operation on the returned object. throws: parsing error
$anObject = AClass::methodReturningAnObject();
$anObject(); //calls: __invoke(); -> works like the first example.
$member = 'methodReturningAnObject';
$anObject = AClass::$member(); // calls
AClass::methodReturningAnObject(); returns: $anObject.
$anObject(); //calls: __invoke(); -> works like the first example.
BUT:
AClass::$member()(); //should: call the __invoke operation on the
returned object. throws: parsing error.
Thats all logical, but not documentated.
An object is still a object, independent from the "storing point"
This is a documentation problem. Not a bogus.
Previous Comments:
------------------------------------------------------------------------
[2009-11-19 11:24:39] vrana@php.net
It's because of priority:
<?php
$instance = "f";
foo::$instance('World'); // calls foo::f('World')
?>
$instance('World') has higher priority than foo::$instance.
------------------------------------------------------------------------
[2009-06-18 15:18:44] pajoye@php.net
not windows specific
------------------------------------------------------------------------
[2009-03-24 19:10:07] biohazard999 at gmx dot at
Description:
------------
If the object to invoke is stored in a static property or is returned
by a static function __invoke will not be called.
Especially for singletons is this extremly missleading.
Either it is an documentation problem or something other is wrong.
Actual documentation:
The __invoke method is called when a script tries to call an object as
a function.
Reproduce code:
---------------
class foo
{
public static $instance = null; //only public for this example
public static function get()
{
if(is_null(self::$instance))
self::$instance = new self;
return self::$instance;
}
public function __invoke($name)
{
echo 'Hello '.$name;
}
}
//1)
foo::get()('World');
//2)
foo::get();
foo::$instance('World');
//3)
$bar = foo::get();
$bar('World');
Expected result:
----------------
1) //Here is the parsing-error partial expected
Hello World
2)
Hello World
3)
Hello World
Actual result:
--------------
1)
Parse error: parse error in test.php on line 23
2)
Notice: Undefined variable: instance in test.php on line 27
Fatal error: Function name must be a string in test.php on line 27
3)
Hello World //Behavior as expected
------------------------------------------------------------------------
--
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Thread (4 messages)