Expand variable in comparison

[Marcus <marcus.k79@xxxxxxxx>]

Hi!


Is there any way to get the following snippet returning a true?


...
$this->var = ?????
if ($this->var == $preDefinedStringToTestWith)
    return true;
else
    false;



The problem:
I don't know, what $preDefinedStringToTestWith is!
$this->var can be set to any string.

I tried
$this->var = "${preDefinedStringToTestWith}"
but this doesn't get expanded.


Thanks for your help,

Marcus.

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