PHP add JSON string in array and encode

Question

Team,

I'm trying to generate a JSON string but I keep running into issues with (I guess) quotes.

Code:

<?php 
// JSON data generated
$attachment = "[{
   'contentType': 'application/json',
   'content': {
      'type': 'mytype',
      'body': [{
         'type': 'TextInfo',
         'text': 'TEST TEXT',
         'wrap': true
      }]
   }
}]";
// Add attachment string (JSON data) in an array
$mydata = array(
  'space' => "abc",
  'markdown' => "**welcome**",
  'attachment' => $attachment
);
// Turn array into one big JSON string
$send_json = json_encode($data2);

What this should generate:

{
   "space": "abc",
   "markdown": "**welcome**",
   "attachment": [{
      'contentType': 'application/json',
      'content': {
         'type': 'mytype',
         'body': [{
            'type': 'TextInfo',
            'text': 'TEST TEXT',
            'wrap': true
         }]
      }
   }]
}

It feels like I'm missing something (besides the required knowledge ;-).

Yep, dont try and build JSON Strings manually. Create a class or array with the right contents and shape and then use json_encode() on it to generate the JSON String — RiggsFolly
– RiggsFolly, Commented Oct 8, 2019 at 16:46
Not sure why you want the sub objects to be in an array, as there is only one object in each case — RiggsFolly
– RiggsFolly, Commented Oct 8, 2019 at 17:11
Try typecasting $mydata = (object)array(); that should give you an object to work with in js rather than an array. — admcfajn
– admcfajn, Commented Oct 8, 2019 at 17:21

mickmackusa · Accepted Answer · 2020-08-14 14:05:35Z

I don't understand how your $attachment data could be "JSON data generated" because it is invalid json ...I hope you aren't manually crafting that json string. You should always just generate an array/object and then call json_encode() when you are finished populating the iterable variable with data.

I have repaired your invalid $attachment string by replacing the " with ' and vice versa.
To nest this data inside $mydata['attachment'] you will need to decode the json first.
Finally, once your array data is completely built, THEN you call json_encode() on $mydata. The PRETTY_PRINT flag is just to aid readability in this post.

Code: (Demo)

$attachment = '[{
   "contentType": "application/json",
   "content": {
      "type": "mytype",
      "body": [{
         "type": "TextInfo",
         "text": "TEST TEXT",
         "wrap": true
      }]
   }
}]';

$mydata = array(
  'space' => "abc",
  'markdown' => "**welcome**",
  'attachment' => json_decode($attachment)
);

$send_json = json_encode($mydata, JSON_PRETTY_PRINT);
echo $send_json;

Output:

{
    "space": "abc",
    "markdown": "**welcome**",
    "attachment": [
        {
            "contentType": "application\/json",
            "content": {
                "type": "mytype",
                "body": [
                    {
                        "type": "TextInfo",
                        "text": "TEST TEXT",
                        "wrap": true
                    }
                ]
            }
        }
    ]
}

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