php loop array and assign function name with value

gistfile1.php

<?php

// iterates through an array and calls the appropriate function

foreach ($key_array as $key_name) {                                       
    if(array_key_exists($key_name, $settings)) {                             
        $function = 'set' . ucwords($key_name);                              
        $this->$function($settings[$key_name]);
    }
}

// v2 should use an iterator, and use a lookup table to declare the function. WIP
// iterates through an array and calls the appropriate function
class LocalIterator implements Iterator
{

	private $position = 0;
	private $array = array(
		"a", "b", "c"
	);

    public __constructor()
    {
    	$this->position = 0;
    }

    public function rewind() {
    	var_dump(__METHOD__);
    	$this->postion = 0;
    }

    public function current() {
    	var_dump(__METHOD__);
    	return $this->array[$this->position];
    }

    public function key() {
    	return $this->position;
    }

    public function next() {
    	++$this->position;
    }

    public function previous() {
    	--$this->position;
    }

   	public function valid() {
   		return isset($this->array[$this->position]);
   	}

   	public function end() {
   		$this->position = count($this->array);
   	}
}

$iterator = new LocalIterator();

foreach ($iterator as $key => $value) {                                       
    if(!array_key_exists($key, $settings)) {
        continue;
    }
    
    $function = 'set' . ucwords($key_name);                              
    $this->$function($settings[$key_name]);

}