为什么我不能将数据从一个类发送到另一个类？

Question

I got a bunch of classes and I want to send data from one class to another. But I am not able to achieve this. Hope you can help me with a solution for this.

I want to send data from this:

Report.php I have included the other file in the top of the file

include('DataReader.php');

public function __construct(){
    $this->pageId = $_POST['pages'];
    $this->since = strtotime($_POST['sincedate']);
    $this->until = strtotime($_POST['untildate']);
    echo "Report: " . $this->pageId . "<br>";
    $this->dataReader = new DataReader();
    $this->dataReader->setPageId($this->pageId);
}

Then i want the data inside the DateReader, but i get nothing? Notice i try to echo it to see if it recieves the data:

DataReader.php

class DataReader {
    private $pageId;
    public $since;
    public $until;
    public $accessToken;
    public $fb;
    /**
     * @var FacebookRest
     */
    private $facebook;

    // Start app with app details from facebook
    public function __construct() {
        echo "DataReader: " . $this->pageId . "<br>";
        $this->facebook = FacebookRest::getInstance();
        $this->facebook->setPageId($this->pageId);
        $this->facebook->setSince($this->since);
        $this->facebook->setUntil($this->until);
    }

    public function setPageId($pageId) { 
        $this->pageId = $pageId; 
        echo $this->pageId; 
    }
}

Hope you cant help me getting data from Report.php into DataReader.pgp.

Answer 1

As a simple example, remember that you can pass instances of classes as parameters to constructors, is the most common thing.

This is just an example and adapt it to your code.

<?php

class Foo
{
    public $name;
    public $bar;

    public function __construct()
    {
        $this->name = "John Doe";
        $this->bar = new Bar($this);
    }
}

class Bar
{
    public function __construct(Foo $foo)
    {
        echo $foo->name;
    }
}

$foo = new Foo(); // Echoes 'John Doe'

In you case, although I don't know the rest of the code and it might not work, I hope you undertood the idea exposed above.

EDIT: Fixed some logic problems, check DataReader class code again

Constructor of the class Report:

public function __construct()
{
    $this->pageId = $_POST['pages'];
    $this->since = strtotime($_POST['sincedate']);
    $this->until = strtotime($_POST['untildate']);
    echo "Report: " . $this->pageId . "<br>";
    $this->dataReader = new DataReader($this);
}

And then

class DataReader
{
    private $pageId;
    public $since;
    public $until;
    public $accessToken;
    public $fb;
    /**
    * @var FacebookRest
    */
    private $facebook;

    // Start app with app details from facebook
    public function __construct(Report $report)
    {
        echo "Report Page ID: " . $report->pageId . "<br>";
    }
}

Now, let's say you create a new Report and the $_POST['pages'] has the value of 55

$report = new Report();

It will echo: 55;