Can i define a function within a funciton and call it from another function i the same class?

[eluser]coldscooter[/eluser]
I want to do something like this in CI:

class myclass(){

function __contruct(){
function test1();
}

public function test1(){
function test2(){
echo 'in function';
}
}

public function test3(){
this->test2();
}

}

So i want to be able to access test2() from within test3(). Is this possible?