Unable to Json Decode

Question

I seemed to be stuck with JSON Decode , i dont know how to decode the json object or maybe im doing something very wrong , iam doing :

$error_fields_structure['product_id'] = $this->input->post('product_id');
$error_fields_structure['main_product_quantity'] = $this->input->post('quantity');
$error_fields_structure = json_encode($error_fields_structure);

i pass $error_fields_structure to my view and in my java script i do:

<?php print_r(json_decode($error_fields_structure)); ?>;

i get an error in firebug and following output

 stdClass Object
(
[product_id] => 62
[product_quantity] => 65
);

but if i do

 <?php print_r(json_decode($error_fields_structure['product_id'])); ?>;

it gives me a null string and an error how do i get particular product_id and product_quantity from json object $error_fields_structure

Answer 1

You can only decode a valid json string.

<?php print_r(json_decode($error_fields_structure['product_id'])); ?>;

is incorrect as $error_fields_structure['product_id'] is not a json string.

Try this :

<?php 
$errorFieldsArr = json_decode($error_fields_structure,true);  //convert json string to array
var_dump($errorFieldsArr['product_id']); // get element from array
 ?>

or

<?php 
$errorFieldsArr = json_decode($error_fields_structure);  //convert json string to stdobject
var_dump($errorFieldsArr->product_id ); // get element from object
 ?>