Convert json to symfony php

Please see my answer below

1. First Your Json should be as below

{"assetList":[
  {
    "name":"https://mobilize-uploads-prod.s3.amazonaws.com/uploads/event/Test-Logo-Small-Black-transparent-1_20180730154641244030.png"
  },
  {
    "name":"https://mobilize-uploads-prod.s3.amazonaws.com/uploads/event/Test-Logo-Small-Black-transparent-1_20180730154641244030.png"
  },
  {
    "name":"https://mobilize-uploads-prod.s3.amazonaws.com/uploads/event/Test-Logo-Small-Black-transparent-1_20180730154641244030.png"
  }
] }

2. First Do a Json_decode in php for your data.

   $json_data = [YOUR_JSON_DATA]
   $data_arr['data'] = json_decode($json_data,true);
   

3. Pass the array to twig // for Symfony php framework

   $this->render("app:index.html.twig", $data_arr);
   

4. In your twig you need to update the code as below to show the Image urls

   {% for img_data in data.assetList %}
       {{ img_data.name }}
   {% endfor %}
   

Let me know if you face any more issue.

If you want to build a similar structure to the JSON inside Twig, you can do this as follows:

{% set thumbnail = { "assetList": [{"name": "http://..."}, {"name": "http://..."}] } %}

If you want to pass a similar structure into the view, e.g. do something like $this->render('my_template', ['thumbnail' => ...] then your php code to generate an array like the one in JSON could look like this:

[
    'assetList' => [
        [
            'name' => 'http://...',
        ],
        [
            'name' => 'http://...',
        ],
    ]
]

edit: Also accessing it in Twig will not be assetList["name"] it will be:

{{ thumbnail["assetList"][0]["name"] }}

Where 0 is the offset of the list entry,i.e. 0-2, if you have 3 images.

If you passed that json as an array towards twig, u would need to use a loop to read out the array assetList

{% for asset in assetList %}
    {{ asset.name }}
{% endfor %}