为什么我的方法没有输出？

Question

I am creating a GoogleMapApi class. Found some in the net but I thought they are not very good for me. So I decided to build my own.

Actually thats not my first class and I am used to it....

Here is what I got:

class GMAPI{

    private $apiKey;
    private $from;;

    public function GMAPI(){

        $this->apiKey = GOOGLE_API_KEY;
    }

    public function setFrom($string){

        $this->from = $this->prepareString($string);
    }


    public function getDistance($type="meter"){

        echo $this->from; //output is empty
        echo $type;       //outputs: meter
    }
}

now I have a other php file with this content

$gmapi = new GMAPI();
$gmapi->setFrom('New York');
$gmapi->getDistance();

//output: meter
//expacted output: New Yorkmeter

i have also tried this

public function setFrom($string){
    echo $string;
    $this->from = $string;
}

But still no result. Not even with

public function setFrom($string="foobar"){
    echo $string;
    $this->from = $string;
}

What am I doing wrong ?!?!?

EDIT: Shorted my Post to have a better overview

Full Code

class.Controller.php

class.GMAPI.php

(according to some comments i changed some var's to not have reserved var's in use)

Answer 1

this code creates new properties on the fly, so it just should be changed as an example below

$this->gmapi->setFromAddress   =   "New York";
$this->gmapi->setToAddress     =   "Boston"; 

this code calls setters

$this->gmapi->setFromAddress("New York");
$this->gmapi->setToAddress("Boston"); 

Happy coding!

Answer 2

them methods setFrom() and setTo() don't return anything. they only set a variable. even echoing won't work because there is nothing to echo .