PHP object json_encode giving NULL values when echoing?

Question

I am currently trying to learn JSON and it is kicking my proverbial behind at the moment.

With a normal variable I was able to encode it fine and then echo to see the JSON string.

However I am wanting to encode an object but its not working:

Class tariff
{

    var $preset_name;
    var $name;
    var $net;
    var $inclusive;
    var $length;
    var $data;


        function __construct()
        {
            $preset_name = "Orange-1gb-ECL";
            $name = array ("1312" => "Orange 1gb Eclipse");
            $net = array ("12312" => "Orange");
            $inclusive = array ("1312" => "1GB");
            $length = array ("12312" => "12 Months");
            $data = array ("12312" => "12p per mb");    
        }




}
        $tariff = new tariff();
        $tariff = json_encode($tariff);

    echo $tariff;
    return 0;

My output is:

{"preset_name":null,"name":null,"net":null,"inclusive":null,"length":null,"data":null}

Ive tried googling and searching on here but can't find my answer!

Help me Obi Wan, your my only hope!

That's not how you set class variables ;-)

Flukey
– Flukey

2011-12-15 17:03:34 +00:00
Commented Dec 15, 2011 at 17:03 — Flukey
– Flukey, Commented Dec 15, 2011 at 17:03

ajreal · Accepted Answer · 2011-12-15 17:04:02Z

2

Oh, you have some wrong usages at the constructor,

Should be like this :-

$this->preset_name = "Orange-1gb-ECL"; <-- assign to object property

Instead of

$preset_name = "Orange-1gb-ECL"; <-- assign local variable

edited Dec 15, 2011 at 17:04

answered Dec 15, 2011 at 16:58

ajreal

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Comments

Sheridan Bulger · Accepted Answer · 2011-12-15 17:03:18Z

2

Elaborating on another answer,

$preset_name = "Orange-1gb-ECL";

in a member function is actually initializing a local variable to the scope of that function. The $this keyword is your reference to your current instance of your current class, for the purpose of accessing constructs such as properties in the class-instance scope.

answered Dec 15, 2011 at 17:03

Sheridan Bulger

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2 Comments

tomaytotomato Over a year ago

but im wanting to add more data later on in an array , this will be going into a pull down menu

Sheridan Bulger Over a year ago

I think you misunderstood what I was saying. I was just talking about the difference between $preset_name (local scope) and $this->preset_name (class instance scope).

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