Trouble setting up closures for class methods - php

Question

I am architecting out a class and so far have something roughly like the following
in main.php
$coolObject = new CoolObject(true);
foreach($array as $key=>$val)
{
$coolObject->doFunction($val);
}
then inside of CoolObject:
class CoolObject
{
private $_useFunction;
public function __construct($useFoo)
{
//THIS IS WHERE I NEED HELP
if($useFoo){
$this->_useFunction = $this->_foo();
}
else{
$this->_useFunction = $this->_bar();
}
}
public function doFunction($values)
{
$this->_useFunction($values);
}
private function foo($values){
//do stuff
}
private function bar($values){
//do other stuff
}
}
I realize I could put an if statement or switch into doFunction that could handle this functionality, but since I'm not hip on closures/lamdas I wasn't sure if this is the right situation for them or if I'm just totally off base

Answer 1

What you're trying to achieve (as far as I know) are function pointers in PHP.
You should really take a look in: Array Pointer to a function in PHP
I still think inheritance will be the easiest/cleaniest way to solve this.
So you would probably end with:
class CoolObject
{
private $_useFunction;
public function __construct($useFoo)
{
//THIS IS WHERE I NEED HELP
if($useFoo){
$this->_useFunction = 'foo';
}
else{
$this->_useFunction = 'bar';
}
}
public function doFunction($values)
{
//Edited as #newacct corrects
$this->$_useFunction($values);
}
private function foo($values){
//do stuff
}
private function bar($values){
//do other stuff
}
}