How to convert a JSON string to an array (PHP)?

Question

using below code to decode json

$categories = json_decode($data);
$categories = $categories->data;

where do i get it

{"categories":[{"id":1,"name":"Utilities","apps":897,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/uti.jpg"},{"id":2,"name":"Productivity","apps":477,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/pro.jpg"},{"id":3,"name":"Music","apps":466,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/mus.jpg"},{"id":4,"name":"Travel","apps":289,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/tra.jpg"},{"id":5,"name":"Navigation","apps":297,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/nav.jpg"},{"id":6,"name":"Books","apps":271,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/boo.jpg"},{"id":7,"name":"Healthcare & Fitness","apps":250,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/hea.jpg"},{"id":8,"name":"Games","apps":5116,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/gam.jpg"},{"id":9,"name":"Social Networking","apps":272,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/soc.jpg"},{"id":10,"name":"Lifestyle","apps":434,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/lif.jpg"},{"id":11,"name":"Finance","apps":200,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/fin.jpg"},{"id":12,"name":"News","apps":128,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/new.jpg"},{"id":13,"name":"Photography","apps":481,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/pho.jpg"},{"id":14,"name":"Entertainment","apps":1251,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/ent.jpg"},{"id":15,"name":"Business","apps":221,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/bus.jpg"},{"id":16,"name":"Sports","apps":199,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/spo.jpg"},{"id":17,"name":"Education","apps":433,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/edu.jpg"},{"id":18,"name":"Medical","apps":262,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/med.jpg"},{"id":19,"name":"Weather","apps":64,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/wea.jpg"},{"id":20,"name":"Reference","apps":419,"iconurl":"http:\/\/static.apptrackr.org\/caticons\/ref.jpg"}]} 

and I would like to convert to an array like this

Array[0]
    {
       id => 1
       name => Utilities
       apps => 897
       iconurl => http:\/\/static.apptrackr.org\/caticons\/uti.jpg
    }

etc.

Answer 1

It looks like a JSON string . You can use json_decode () to convert it to a PHP variable, for example.

$obj = json_decode($json);
print_r($obj->categories); // array of StdClass objects

You can regularly iterate through an array of categories

echo $obj->categories[0]->name; // Utilities
echo $obj->categories[1]->name; // Productivity
echo $obj->categories[2]->name; // Music

To convert StdClass objects to arrays, you could do

$categories = array();
foreach (json_decode($json)->categories as $category) {
    $categories[] = (array) $category;
}
print_r($categories);

You can also do this with the lambda function and array_map :

// Before PHP5.3
$categories = array_map(
    create_function('$el', 'return (array) $el;'), 
    json_decode($json)->categories);

// After PHP5.3
$categories = array_map(
    function($el) { return (array) $el; }, 
    json_decode($json)->categories);

Answer 2

Erm, JSON :

$categories = json_decode($data, true);

Answer 3

get_object_vars http://php.net/manual/en/function.get-object-vars.php

Answer 4

@Gordon seems right - it looks like JSON. Assuming, however, that you are dealing with an “actual” PHP object, then it will be iterable; just skip it with foreachand push each key / value pair into your target array.