Convert Object of class stdClass to JSON Object

Question

this is what i have in my php file:

$session = $m->session;

$session is now:

object(stdClass)[31]
  public 'id' => string '21112' (length=5)
  public 'external_id' => string '' (length=0)
  public 'sessiongroupid' => string '1843' (length=4)
  public 'eventid' => string '5588' (length=4)
  public 'order' => string '0' (length=1)
  public 'name' => string 'Ferdau Conference' (length=17)
  public 'description' => string 'Ferdau Conference' (length=17)
  public 'starttime' => string '2013-04-18 18:00:00' (length=19)
  public 'endtime' => string '2013-04-18 18:04:00' (length=19)
  public 'speaker' => string '' (length=0)
  public 'location' => string 'Waregem' (length=7)
  public 'mapid' => string '0' (length=1)
  public 'xpos' => string '0.000000' (length=8)
  public 'ypos' => string '0.000000' (length=8)
  public 'maptype' => string 'plan' (length=4)
  public 'imageurl' => string '' (length=0)
  public 'presentation' => string '' (length=0)
  public 'organizer' => string '0' (length=1)
  public 'twitter' => string '' (length=0)
  public 'allowAddToFavorites' => string '0' (length=1)
  public 'allowAddToAgenda' => string '0' (length=1)
  public 'votes' => string '0' (length=1)
  public 'url' => string 'http://ferdau.be' (length=16)
  public 'venueid' => string '0' (length=1)

I want to send all the information to a function named save in my javascript file. Like this:

echo '<a onclick="save('.$session.')" style="cursor:pointer;" class="metacell">
                        <img src="'.buildUri("images/icons/favorite.png").'" width="16" />
                        <span>Add to favorites</span>
                    </a>';

When I try this I always get an error that only a string can be send. How can I convert this object to something I can send to my javascript function?

I've tried this with no result: $data = json_encode($session);

When I do $data = json_encode((array)$session)

I get this:

<a class="metacell" style="cursor:pointer;" ferdau.be","venueid":"0"})"="" \="" 18:04:00","speaker":"","location":"waregem","mapid":"0","xpos":"0.000000","ypos":"0.000000","maptype":"plan","imageurl":"","presentation":"","organizer":"0","twitter":"","allowaddtofavorites":"0","allowaddtoagenda":"0","votes":"0","url":"http:\="" 18:00:00","endtime":"2013-04-18="" conference","starttime":"2013-04-18="" conference","description":"ferdau="" id":"21112","external_id":"","sessiongroupid":"1843","eventid":"5588","order":"0","name":"ferdau="" onclick="save({">

Possible duplicate. http://stackoverflow.com/questions/4697656/using-json-encode-on-objects-in-php-regardless-of-scope — karmafunk, Apr 17 '13 at 14:35
In PHP >= 5.4.0 there is a new interface for serializing objects to JSON : JsonSerializable — karmafunk, Apr 17 '13 at 14:37
Also, don't forget that json_encode makes an string using double quotes. — Wesley Schleumer de Góes, Apr 17 '13 at 14:38

score 35 · Accepted Answer · answered Apr 17 '13 at 14:50

$data = json_encode((array)$session); is the right way to go.

I'm guessing that the html you are showing there is what you see in firebug/chrome dev tools/IE dev tools. That is what it looks like after the browser attempts to render it. Try looking at the raw source to see what the output actually looks like. Your problem at this point is caused by the double quotes from json_encode causing the browser engine to consider the onclick attribute closed before the end of the values from $data.

You will need to do some mix of escaping double-quotes and/or using single-quotes in the HTML. I'd start with single-quotes, as that will be more simple. But you will also have to make sure none of the values in $data include unescaped single quotes (as that would result in the same problem).

And then how can I read the json values in my javascript code? — nielsv, Apr 17 '13 at 15:07
See http://www.json.org/js.html. In particular: `To convert a JSON text into an object, you can use the eval() function. eval() invokes the JavaScript compiler. Since JSON is a proper subset of JavaScript, the compiler will correctly parse the text and produce an object structure. The text must be wrapped in parens to avoid tripping on an ambiguity in JavaScript's syntax. var myObject = eval('(' + myJSONtext + ')');` — Jeffrey Blake, Apr 17 '13 at 17:03

Convert Object of class stdClass to JSON Object

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