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Here i wan t to share about language variable variable. You can visit complate tutorial here.

What does that mean $this->{$var}?

This is example how to use $this->4{$var}

$this->a = "hello";
$this->b = "hi";
$this->val = "howdy";

$val = "a";
echo $this->{$val}; // outputs "hello"

$val = "b";
echo $this->{$val}; // outputs "hi"

echo $this->val; // outputs "howdy"

echo $this->{"val"}; // also outputs "howdy"

Working example: http://3v4l.org/QNds9
This of course is working within a class context. You can use variable variables in a local context just as easily like this:

$a = "hello";
$b = "hi";

$val = "a";
echo $$val; // outputs "hello"

$val = "b";
echo $$val; // outputs "hi"

Working example: http://3v4l.org/n16sk.

src: http://bit.ly/14238Mr