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Bug #42559 $this leaks to scope of statically called method
Submitted: 2007-09-05 10:21 UTC Modified: 2007-09-05 12:34 UTC
From: arnout at argeweb dot nl Assigned:
Status: Not a bug Package: Class/Object related
PHP Version: 5.2.4 OS: BSD
Private report: No CVE-ID: None
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 [2007-09-05 10:21 UTC] arnout at argeweb dot nl
Description:
------------
Within methods the $this variable seems to leak into the scope of statically called methods. Even when the called static function is in an entirely different class.
It only happens when the statically called method is not explicitly defined as static.

Reproduce code:
---------------
<?php

class instance{
    
    var $test = 'test';
    
    function do_thing(){
        static_class::func();
    }
}

// happens with and without the abstract keyword
abstract class static_class{
    
    function func(){
        echo 'output: '.$this->test.'<br/>';
        echo 'class: '.get_class( $this ).'<br/>';
        echo 'How did I get here?<br/>';
    }
    
}

$instance = new instance();
$instance->do_thing();
?> 

Expected result:
----------------
A warning telling me I shouldn't use $this in a static scope.
Or just a notice saying $this is not defined / not an object.

Actual result:
--------------
output: test<br/>
class: instance<br/>
How did I get here?<br/>

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 [2007-09-05 12:34 UTC] johannes@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Mark your function as static and you get an error telling "Using $this when not in object context"
 
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