oop ผมทำผิดตรงไหนครับ ช่วยดูหน่อยทำไมมันไม่ยอม decrement ให้

private function print_parent($message, $depth = 0,$count=1)
    {
        foreach ($message as $c)
        {
            
            $this->format_message($c, $depth,$count);
            
            if (isset($this->children[$c['id']]))
            {
                $array_count= count($this->children[$c['id']])."<br />";
			
                $this->print_parent($this->children[$c['id']], $depth + 1,$array_count);
            }
            if($depth==1){
                $count--; echo $count."<br />";
            }
            
        }
    }