从方法中的一类返回多个值 [英] Return multiple values from a method in a class

问题描述

我想从一个方法返回多个变量。

I am trying to return multiple variables from a method.

这是我到目前为止已经试过：

This is what I have tried so far:

这code是在类中的方法：

This code is the method in the class:

public function getUserInfo(){
$stmt = $this->dbh->prepare("SELECT user_id FROM oopforum_users WHERE username = ?");
$stmt->bindParam(1, $this->post_data['username']);
$stmt->execute();

while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {

$user_id = $row['user_id'];
$thumb = $row['thumbnail'];
}
return array($user_id, $thumb);
}

我试图将每个变量放置在列表在调用程序使用：

I attempt to place each variable in a list for use in the calling program:

session_start();
require_once('init.php');

$username = trim($_POST['username']);
// create a new object
$login = new Auth($_POST, $dbh);

    if($login->validateLogin()){

        $_SESSION['loggedin'] = true;
        list($user_id, $thumb) = $login->getUserInfo($user_id, $thumb);
        echo $user_id . ' ' . $thumb;

    }

这已经行不通了。

我怎样才能返回多个变量数组从方法的类中在调用程序使用？

How can I return an array of multiple variables from a method within a class for use in the calling program?

推荐答案

您在类中定义的方法不匹配，你在呼唤什么。

The method that you define in the class doesn't match what you are calling.

// In the class, you have:
getUserInfo();

// But you call this:
getUserInfo($user_id, $thumb);

由于这个原因，PHP认为你调用一个不同的方法，因此没有返回值（至少没有用在这里）。

Because of this, PHP thinks you are calling a different method, and thus returns nothing (at least nothing of use here).

您调用应该是这样的：

list($user_id, $thumb) = $login->getUserInfo(); //Note that there are no parameters.

别的东西，你应该看看使用关联数组。它看起来是这样的：

Something else you should look at is using an associative array. It would look something like this:

//In the class:
public function getUserInfo() {
  ...
  return array(
    'id'    => $user_id,
    'thumb' => $thumb
  );
}

//And then for your call:
$user = $login->getUserInfo();

echo $user['id'].' '.$user['thumb'];

编码时，这样的事情，因为我有$相关事物的数组p $ PFER，而不是一组独立的变量这将是我的preference。但是，这是所有preference。

This would be my preference when coding something like this, as I prefer having an array for related things, as opposed to a set of independent variables. But that is all preference.

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