Description:
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$this->answer['id'] is always at the end, when it is supposed to be shuffled.

This looks like a bug to me. array_rand() will not work either. 

            $this->current_set=$this->dbh->query("SELECT DISTINCT id FROM $game_type WHERE id != '".(string)$this->answer['id']."' ORDER BY rand() LIMIT 2;")->fetchAll(PDO::FETCH_COLUMN);
            //$this->complete_set=""
            //echo "Current set separated by commas is ".implode(",",$this->current_set->fetchAll(PDO::FETCH_COLUMN)) + $this->answer['id']."<br />";
            //$this->current_set=$this->current_set->fetchAll(PDO::FETCH_COLUMN);

            array_push($this->current_set,$this->answer['id']);
            explode(",",$this->current_set);
            shuffle($this->current_set); // $this->answer['id'] is always at the end?
            print_r($this->current_set);
            print_r($this->answer['id']);
            var_dump($this->current_set, 3);

Test script:
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            $this->current_set=$this->dbh->query("SELECT DISTINCT id FROM $game_type WHERE id != '".(string)$this->answer['id']."' ORDER BY rand() LIMIT 2;")->fetchAll(PDO::FETCH_COLUMN);
            //$this->complete_set=""
            //echo "Current set separated by commas is ".implode(",",$this->current_set->fetchAll(PDO::FETCH_COLUMN)) + $this->answer['id']."<br />";
            //$this->current_set=$this->current_set->fetchAll(PDO::FETCH_COLUMN);

            array_push($this->current_set,$this->answer['id']);
            explode(",",$this->current_set);
            shuffle($this->current_set); // $this->answer['id'] is always at the end?
            print_r($this->current_set);
            print_r($this->answer['id']);
            var_dump($this->current_set, 3);

Expected result:
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I expect the array '$this->current_set' to have the value of $this->answer pushed towards the end. Then I shuffle() or array_rand() the array, but $this->answer always appears as the third element of the array no matter what I do.