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Bug #33652 $this not available in a variable variable
Submitted: 2005-07-12 03:06 UTC Modified: 2005-07-12 11:32 UTC
From: ludvig dot ericson at gmail dot com Assigned: dmitry (profile)
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5CVS-2005-07-11 OS: *
Private report: No CVE-ID: None
 [2005-07-12 03:06 UTC] ludvig dot ericson at gmail dot com
Using variable variables ($$MyVar) in classes, through functions that is, doesn't allow $this to be used.

I tried with $this (notice the $) too, no difference.
A workaround is to check the object name, if it's "this" you could $this->$Mem instead.

Reproduce code:
class Foo {
    public $MyVal = "Test";

    public Bar($Obj, $Mem) {
        return ${$Obj}->$Mem;

$TheObject = new Foo();
$Objname = "this";
$Memname = "MyVal";
echo $TheObject->Bar($Objname, $Memname);

Expected result:
I expect it to output "Test"

Actual result:
Notice: Undefined variable: this in (filepath) on line 6
Notice: Trying to get property of non-object in (filepath) on line 6


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 [2005-07-12 03:30 UTC]
Notice also that ${'this'} will work but not ${'this'.''} or ${(string)'this'} for example.

It should be at least documented that this pseudo-variable lacks some features.
 [2005-07-12 10:20 UTC]
Works fine with PHP 4.4.0, not with latest CVS HEAD.

 [2005-07-12 11:32 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

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Last updated: Tue Sep 27 09:03:41 2022 UTC