CODEWITHSUNDEEP
php
HippoDuck
HippoDuck

Reputation: 2194

How to call a function based on a variable from an object within the same class?

I know how to call a function based off a variable like this:

$platform->ConfigurePlatform($client);

Where $platform is a variable which contains the name of the class.

I am trying to call a function like this, but object based from within the same class. The below will work fine, which is fine for within the same method. 

$platform = new $platform_name();
$platform->ConfigurePlatform($client);

But I want to call another method within the object like this:

$this->$platform->GetOrdersFromPlatform();

This will give the error below:

Fatal error: Cannot access empty property (On the line above)

I thought maybe I should create the object like this instead:

$this->$platform = new $platform_name();

However this gives the error below:

Fatal error: Cannot access empty property (On the line above)

How can I achieve this?

Upvotes: 2

Views: 60

Answers (2)

Rafael
Rafael

Reputation: 1535

If you plan to use the same object in different places of the class, you just need to set it into an attribute of the same class.

class Station
{
    public $platform = null;

    public function start()
    {
        $this->platform = new Platform();

        $this->platform->ConfigurePlatform('test');
    }

    public function getOrders()
    {
        return $this->platform->GetOrdersFromPlatform();
    }
}

class Platform
{
    private $orders = null;

    public function ConfigurePlatform($string)
    {
        $this->orders = $string;

        return $this;
    }

    public function GetOrdersFromPlatform()
    {
        return $this->orders;
    }
}


$test = new Station();
$test->start();

echo $test->platform->GetOrdersFromPlatform();
//or
echo $test->getOrders();

This is the code tested: https://3v4l.org/UuTgb

Upvotes: 0

Erisan Olasheni
Erisan Olasheni

Reputation: 2905

Your question is not clear, but I think what you want is method chaining, this can be done by return the $this property of the class. Example:

class ClassName
{
    function ConfigurePlatform($client)
    {
        // What to do
        echo __METHOD__.": ".$client."\n";

        // return the $this property to make the class properties chainable
        return $this;
    }

    function GetOrdersFromPlatform($client)
    {
        // What to do
        echo __METHOD__.": ".$client."\n";

        // return the $this property to make the class properties chainable
        return $this;
    }
}


$classObj = new ClassName();

$client = "Firefox/Chrome/Safari";

// Call both methods

$classObj->ConfigurePlatform($client)->GetOrdersFromPlatform($client);
//ClassName::ConfigurePlatform: Firefox/Chrome/Safari ClassName::GetOrdersFromPlatform: Firrefox/Chrome/Safari

Upvotes: 2

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