2-dimensional JSON array to PHP

Question

I have a JSON encoded array that looks like this (it came from a 2d PHP string array):

[
[
    "a1",
    "a2",
    "a3",
    "a4"
],
[
    "b1",
    "b2",
    "b3",
    "b4"
],
[
    "c1",
    "c2",
    "c3",
    "c4"
]
]

It has been validated on http://jsonlint.com/

Now I want to send this array to another page by Ajax and convert it back to a 2d PHP array. After making a JSON array I do the following (where myJsonArray is the name I gave to the array after making it into a Javascript array.:

$.ajax({
       type: "GET",
       url: "somewhere.php",
       data: {jsonArray : myJsonArray},
       dataType: "json",
       success: function(msg){
         alert( msg); 
       }

     });
 }

And then in somewhere.php I do:

 $json_array = $_GET['jsonArray'];

 $myArray = json_decode($json_array,true);

But when I echo the result I just get

[Object object]

I'm not sure how to recreate the PHP array.

EDIT: How to make myJsonArray:

<?php
$array = json_encode($original_array);

echo "var myJsonArray = ". $array . ";\n";
?>

I would also like to point out that for tesitng purposes, in the alert box I made it print myJsonArray on success, and it did indeed print out the array as expected.

"After making a JSON array..." How did you do this? Sure seems like that's where the problem would be. Seems like you've left out the most important code. — I Hate Lazy
– I Hate Lazy, Commented Dec 2, 2012 at 18:21
Did you check how JsonArray looks like in html? Also did you try to echo not decoded $_GET['jsonArray']; — ozahorulia
– ozahorulia, Commented Dec 2, 2012 at 18:37
@Pankaj Khairnar - the output is a1,a2,a3,a4,b1,b2,b3,b4,c1,c2,c3,c4 — user485498
– user485498, Commented Dec 2, 2012 at 18:40

Adam Lockhart · Accepted Answer · 2012-12-02 19:02:07Z

2

"[Object object]" is javascript evaluating an object as a string.

When you pass the optional "true" into json_decode, you are telling it that it is an associative array. But you really want an array of arrays.

I am sure that if you use JSON.stringify to print to your log, you would have the correct data, except the outer brackets would be "{..}".

edited Dec 2, 2012 at 19:02

answered Dec 2, 2012 at 18:43

Adam Lockhart

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2 Comments

user485498 Over a year ago

You are correct. JSON.stringify worked, although I'm not sure why.

Adam Lockhart Over a year ago

The actual solution here is to not pass true into json_decode(). The JSON.stringify() was just to help you see the data. Unlike php, javascript treats associative arrays as objects.

Rubin Porwal · Accepted Answer · 2012-12-02 19:32:29Z

-1

I have tried executing below code snippet for decoding json content as specified above and it is working fine for me.

<?php
               $a=array(array("a1","a2","a3","a4"),array("b1","b2","b3","b4"),array("c1","c2","c3","c4"));
               $json_content=json_encode($a);
              $json_array=json_decode($json_content,true);
               echo '<pre>';
                print_r($json_array);
?>

answered Dec 2, 2012 at 19:32

Rubin Porwal

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1 Comment

Adam Lockhart Over a year ago

This is not an answer, and doesn't address the question.

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