PHP 从嵌套的 JSON 数组中检索值

Question

I'm working with the following JSON Object:

    {
  "body": {
    "subject": "Lorem ipsum dolor sit amet, consectetur adipiscing elit", 
    "to": [
      {
        "location": "Hawthorne, CA", 
        "name": "Jeff Daniels", 
        "phoneNumber": "+15552123456", 
        "target": true
      }
    ], 
    "type": "SMS"
  }, 
  "uuid": "5797377010673708914"
}

I'm trying to retrieve certain values and can't work out the syntax to get the to phoneNumber value. Here's what I'm doing so far:

$webhook= json_decode( $webhookJSON, TRUE );
$subject = $webhook['body']['subject'];
$toPhoneNumber = $webhook['body']['to']['phoneNumber'];

I'm getting the $subject but not the $toPhoneNumber . I've tried adding [0] in a few places to get the first member of the array but this isn't working either and at this stage I'm stumped as to how I can get the to phoneNumber value from the nested array.

Answer 1

You were on the correct way with adding [0] to it. I highly suggest, that you should use print_r() to double check the structure of the array, if your are unsure. It would give you this:

Array
(
    [body] => Array
        (
            [subject] => Lorem ipsum dolor sit amet, consectetur adipiscing elit
            [to] => Array
                (
                    [0] => Array
                        (
                            [location] => Hawthorne, CA
                            [name] => Jeff Daniels
                            [phoneNumber] => +15552123456
                            [target] => 1
                        )

                )

            [type] => SMS
        )

    [uuid] => 5797377010673708914
)

As you can see, you can acces the phonenumber via

$toPhoneNumber = $webhhok['body']['to'][0]['phoneNumber'];

The reason is, that you start an array within the json, everytime you use [] . That's why you need to use an index to access the element.

When you are in charge of the json, I would recommend to remove the array, because you don't need it there, unless you want to have multiple receipients:

{
  "body": {
    "subject": "Lorem ipsum dolor sit amet, consectetur adipiscing elit",
    "to": {
      "location": "Hawthorne, CA",
      "name": "Jeff Daniels",
      "phoneNumber": "+15552123456",
      "target": true
    },
    "type": "SMS"
  },
  "uuid": "5797377010673708914"
}