Encoding JSON Through PHP

Question

Ok so I am trying to make a loop in php for json but I dont know what or how to loop it where I can keep the format I want for the JSON output. This is what i have:

$number = array(31,25,160);
$json_holder = array();
$counter = count($names);
$i = 0;

while($i < $counter){
    $json_holder = array('user'=> array('results'=> array('tagnumber' => $number[$i],'status'=>'good'),);
    echo json_encode($json_holder);
    $i++;
}

And my output:

{"user":{"results":{"tagnumber":31,"status":"good"}}}  
{"user":{"results":{"tagnumber":25,"status":"good"}}}  
{"user":{"results":{"tagnumber":160,"status":"good"}}}

So instead of making new JSON root elements everytime I want to just make a new array in results so it would output like:

{
    "user": {
        "results": [{
            "tagnumber": 31,
        } {
            "tagnumber": 25,
        } {
            "tagnumber": 160,
        }],
        "status": "okay"
    }
}

I hope I am making sense

How does your while loop not infinite loop without an $i++? — Kevin Ji
– Kevin Ji, Commented Dec 2, 2013 at 2:45
The format your would like isn't a very good one. What if different objects have different statuses? Usually, having an object with just one property indicates bad design. — Felix Kling
– Felix Kling, Commented Dec 2, 2013 at 2:46

David · Accepted Answer · 2013-12-02 02:46:01Z

2

Code

$number = array(31,25,160);
$payload = array('user' => array('results' => array(), 'status' => 'okay'));
foreach ($number as $num) {
   $payload['user']['results'][]['tagnumber'] = $num;
}
echo json_encode($payload);

No need for a for() loop here.

Output

{
    "user": {
        "results": [
            {
                "tagnumber": 31
            },
            {
                "tagnumber": 25
            },
            {
                "tagnumber": 160
            }
        ],
        "status": "okay"
    }
}

answered Dec 2, 2013 at 2:46

David

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5 Comments

Kevin Ji Over a year ago

I think it'd be better to attach the status to each individual tagnumber group than to only have one for the entire user.

David Over a year ago

Well that's not what he/she requested.

Dave Over a year ago

@mc10: You are completely right but I am just starting to learn JSON and its concepts as this was something I needed to help put the piece to a puzzle together.

Dave Over a year ago

@David Great. A lot of clarity was provided with that answer. I dont know why I was so bent on using a for loop instead of a foreach. I can see how to structure this better now

David Over a year ago

It just makes it easier. Learning how to manipulate array()s comes with time, and once you master them, it makes things like this a lot easier to work on.

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