依賴注入的構造 - 型暗示不工作

Question

我有這樣的代碼：

<?php 
namespace Http\Models; 

class DbModel { 
    private $dbh; 

    public function __construct(\Ilib\Database\Database $dbh) { 
     $this->dbh = $dbh;  
    } 

    public function select(){ 
     $this->dbh->query("SELECT * from prednasky ORDER by mesic ASC"); } 
    } 
} 

我看到錯誤：

Catchable fatal error: Argument 1 passed to Http\Models\DbModel::__construct() must be an instance of Ilib\Database\Database, none given, where Ilib\Database\Database is the connection into the pdo db. 

但我的問題是，我在哪裏可以創建一個新的實例？以及它如何看待這個實例？

Answer 1

$database = new \Ilib\Database\Database(); 
$model = new DbModel($database);