PHP __construct不接受变量

Question

I can't seem to find a answer for that, maybe somebody here can help me.

I'm trying to pass in a database connection in the construct of my class but i'm getting an error "Missing argument 1 for item::__construct() " ,

I'v tried setting it with a setter method it works perfectly, so i know the variable with the database connection is right.

I'v tried to pass in the constructor plain text, like $item = new item('abc') and then I'm getting it perfectly.

The reason I want it in the constructor is because its a database connection so I'll always need it.

In index.php the code is not in a class so the problem cannot be the scope.

Here is the code. index.php.

$dbh = new dbh;
$item = new item($dbh);

item.php

<?php
class item{
    protected $costumerId;
    private $databaseConnection;

        public function __construct(dbh $database) {
            $this->databaseConnection = $database;
            var_dump($this->databaseConnection);
        }

        public function setCostumer($costumerId) {
            $this->costumerId = $costumerId;
        }
public function getItems(){
            try {

                $query = 'SELECT * FROM items WHERE costumerId = :costumerId';

                //Execute
                $this->result = $this->databaseConnection->getRows($query, array(':costumerId' => $this->costumerId),'item');
                return $this->result;
            }
            catch(Exception $e) {
                var_dump($e->getMessage());
            }
        }
    }
?>

Thanks in advance.

Edit this is the database connection class.

    class dbh {

            public $isConnected;
            public $connection;

        public function __construct()
        {
            try {
                $this->connection = new PDO ('mysql:host=localhost;dbname=test','username','password');
                $this->isConnected = true;
                var_dump($this->connection);
            }
            catch(PDOException $e) {
                $this->isConnected = false;
                throw new Exception ($e->getMessege());
            }
        }

public function getRows($query, $params=array(), $class = 'assoc') {
            try {
                $stmt = $this->connection->prepare($query);
                $stmt->execute($params);
                if($class != 'assoc'){
                    $stmt->setFetchMode(PDO::FETCH_CLASS, $class);
                    return $stmt->fetchall();
                    }
                else {
                    $stmt->setFetchMode(PDO::FETCH_ASSOC);
                    return $stmt->fetchall(); 
                    }
            }
            catch (PDOException $e) {
                throw new Exception($e->getMessage());
            }
        }
     }

EDIT i see now that im only getting the error when the next statment is there, i mean if i comment out the next statment after $item = new item($dbh) that is $items->setCostumer(6); im not getting the error,

EDIT: ok i found that when i call the function getItems, or more spacificly the line $this->result is causing the error. but i still dont know why

Answer 1

I ran:

<?php

class item {
    public function __construct($database) {
        $this->db = $database;
        var_dump($this->db);
    }
}

class dbh {

    public $isConnected;
    public $connection;

    public function __construct()
    {
        try {
            $this->connection = new PDO('mysql:host=localhost;dbname=db', 'user', 'password');
            $this->isConnected = true;
            var_dump($this->connection);
        }
        catch(PDOException $e) {
            $this->isConnected = false;
            throw new Exception ($e->getMessege());
        }
    }
 }

$dbh = new dbh();

$item = new item($dbh);

?>

And it worked just fine...

object(PDO)#2 (0) {
}
object(dbh)#1 (2) {
["isConnected"]=>
bool(true)
["connection"]=>
object(PDO)#2 (0) {
  }
}