Multidimensional PHP Array to JSON Array

Question

I have this PHP Array:

Array
(
    [messages] => Array
        (
            [0] => Array
                (
                    [sender] => 17
                    [receiver] => 4
                    [message] => TEST 2
                    [timestamp] => 1367200891
                    [read] => 0
                )

            [1] => Array
                (
                    [sender] => 17
                    [receiver] => 4
                    [message] => TEST 1
                    [timestamp] => 1367197661
                    [read] => 0
                )

        )

    [new_messages] => 2
)

It gets retrieved via an Ajax Request, using json_encode() to output it in PHP.

function getMessages(rec){
var nmsg = $.ajax({
        type: "GET",
        async: true,
        url: "/ps/getUserMessages.php",
        data: {'u':rec,'s00':s00,'n01':n01,'t02':t02}       
    });
    nmsg.done(function(data) {
        var json = JSON.parse(data);
        if (typeof json.messages[0].message !== 'undefined') {
            printMessage(json);
        }
    }); 
}

And as printMessage() function, for example, i need to do something like:

loop(){
    $("#elem").append(
          '<div>Sender: '+arrayOfValues.sender+'</div>'
         +'<div>Message: '+arrayOfValues.message+'</div>'
    );
}

for each Array of values.

I tried jQuery $.each() and also for() with some examples i found, but i cannot get to work.

Use serialize() and unserialize() to pass an array between php and js and back again easily. Or you can use json_encode() on your code behind php page. then pass it back to your ajax function which can then dump that into a text box which can be posted and json decoded or you can json decode in javascript too and get an array out either way will work fine. — Dave
– Dave, Commented Apr 30, 2013 at 7:20
@Dave I think the problem is not within the encoding, but with accessing the received result. — Sirko
– Sirko, Commented Apr 30, 2013 at 7:24
Not seeing where the outputting to PHP is in that then as it looks from his code like he's purely attempting to handle it in JS. — Dave
– Dave, Commented Apr 30, 2013 at 7:26
@dave i said that i was using json_encode() to pass it to javascript. Read well :) The array it's there just for let you see the structure. — Fr0z3n
– Fr0z3n, Commented Apr 30, 2013 at 7:41
if your php is passing it back as JSON then just set your ajax data type to ajax dataType: 'json' and then use the onsuccess function success: function(data){ and you can reference your array as just data["column"] etc so you don't have to mess around parsing json etc you can just directly loop it out. you can remove at least 7 lines of code from your overall code. — Dave
– Dave, Commented Apr 30, 2013 at 7:50

Marek Lewandowski · Accepted Answer · 2013-04-30 07:22:07Z

3

If you want to iterate over given structure you should use use following as a printMessage:

function printMessage( json ){
    for ( var i in json.messages ) {
        var currentMessage = json.messages[i];

        $("#elem").append(
          '<div>Sender: '+currentMessage.sender+'</div>'
         +'<div>Message: '+currentMessage.message+'</div>'
        );
    }

}

answered Apr 30, 2013 at 7:22

Marek Lewandowski

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3 Comments

Andreas Over a year ago

Don't use for(var i in ...) for arrays. It's for objects and nothing else.

casraf Over a year ago

So this answer is a suitable solution for this case (reference: w3schools.com/js/js_loop_for.asp)

Andreas Over a year ago

@henasraf Better use MDN as a reference instead of w3schools. Why? Have a look at w3fools.com - developer.mozilla.org/en-US/docs/JavaScript/Reference/…

Sirko · Accepted Answer · 2013-04-30 07:22:26Z

0

Something like this should work:

function printMessage(data) {
  for( var i=0; i<data.messages.length; i++ ) {
    $("#elem").append(
        '<div>Sender: ' + data.messages[i].sender + '</div>'
       +'<div>Message: ' + data.messages[i].message+ '</div>'
    );
  }
}

answered Apr 30, 2013 at 7:22

Sirko

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