iteracja po obiekcie JSON

Chcę zrobić prosty Webhook do serwera GIT na bazie tego przykładu
https://docs.gitea.io/en-us/webhooks/

jak w PHP "wydobyć" wszystkie commits[].message oraz repository.name?
Ostatnio używałem php jak oficjalna była wersja 3 i nowością bylo 4 :D

mam:

$decoded = json_decode($payload, true);

zawartosc $payload

{
  "secret": "3gEsCfjlV2ugRwgpU#w1*WaW*wa4NXgGmpCfkbG3",
  "ref": "refs/heads/develop",
  "before": "28e1879d029cb852e4844d9c718537df08844e03",
  "after": "bffeb74224043ba2feb48d137756c8a9331c449a",
  "compare_url": "http://localhost:3000/gitea/webhooks/compare/28e1879d029cb852e4844d9c718537df08844e03...bffeb74224043ba2feb48d137756c8a9331c449a",
  "commits": [
    {
      "id": "bffeb74224043ba2feb48d137756c8a9331c449a",
      "message": "Webhooks Yay!",
      "url": "http://localhost:3000/gitea/webhooks/commit/bffeb74224043ba2feb48d137756c8a9331c449a",
      "author": {
        "name": "Gitea",
        "email": "[email protected]",
        "username": "gitea"
      },
      "committer": {
        "name": "Gitea",
        "email": "[email protected]",
        "username": "gitea"
      },
      "timestamp": "2017-03-13T13:52:11-04:00"
    }
  ],
  "repository": {
    "id": 140,
    "owner": {
      "id": 1,
      "login": "gitea",
      "full_name": "Gitea",
      "email": "[email protected]",
      "avatar_url": "https://localhost:3000/avatars/1",
      "username": "gitea"
    },
    "name": "webhooks",
    "full_name": "gitea/webhooks",
    "description": "",
    "private": false,
    "fork": false,
    "html_url": "http://localhost:3000/gitea/webhooks",
    "ssh_url": "ssh://gitea@localhost:2222/gitea/webhooks.git",
    "clone_url": "http://localhost:3000/gitea/webhooks.git",
    "website": "",
    "stars_count": 0,
    "forks_count": 1,
    "watchers_count": 1,
    "open_issues_count": 7,
    "default_branch": "master",
    "created_at": "2017-02-26T04:29:06-05:00",
    "updated_at": "2017-03-13T13:51:58-04:00"
  },
  "pusher": {
    "id": 1,
    "login": "gitea",
    "full_name": "Gitea",
    "email": "[email protected]",
    "avatar_url": "https://localhost:3000/avatars/1",
    "username": "gitea"
  },
  "sender": {
    "id": 1,
    "login": "gitea",
    "full_name": "Gitea",
    "email": "[email protected]",
    "avatar_url": "https://localhost:3000/avatars/1",
    "username": "gitea"
  }
}

<?php
$json = '{
  "secret": "3gEsCfjlV2ugRwgpU#w1*WaW*wa4NXgGmpCfkbG3",
  "ref": "refs/heads/develop",
  "before": "28e1879d029cb852e4844d9c718537df08844e03",
  "after": "bffeb74224043ba2feb48d137756c8a9331c449a",
  "compare_url": "http://localhost:3000/gitea/webhooks/compare/28e1879d029cb852e4844d9c718537df08844e03...bffeb74224043ba2feb48d137756c8a9331c449a",
  "commits": [
    {
      "id": "bffeb74224043ba2feb48d137756c8a9331c449a",
      "message": "Webhooks Yay!",
      "url": "http://localhost:3000/gitea/webhooks/commit/bffeb74224043ba2feb48d137756c8a9331c449a",
      "author": {
        "name": "Gitea",
        "email": "[email protected]",
        "username": "gitea"
      },
      "committer": {
        "name": "Gitea",
        "email": "[email protected]",
        "username": "gitea"
      },
      "timestamp": "2017-03-13T13:52:11-04:00"
    }
  ],
  "repository": {
    "id": 140,
    "owner": {
      "id": 1,
      "login": "gitea",
      "full_name": "Gitea",
      "email": "[email protected]",
      "avatar_url": "https://localhost:3000/avatars/1",
      "username": "gitea"
    },
    "name": "webhooks",
    "full_name": "gitea/webhooks",
    "description": "",
    "private": false,
    "fork": false,
    "html_url": "http://localhost:3000/gitea/webhooks",
    "ssh_url": "ssh://gitea@localhost:2222/gitea/webhooks.git",
    "clone_url": "http://localhost:3000/gitea/webhooks.git",
    "website": "",
    "stars_count": 0,
    "forks_count": 1,
    "watchers_count": 1,
    "open_issues_count": 7,
    "default_branch": "master",
    "created_at": "2017-02-26T04:29:06-05:00",
    "updated_at": "2017-03-13T13:51:58-04:00"
  },
  "pusher": {
    "id": 1,
    "login": "gitea",
    "full_name": "Gitea",
    "email": "[email protected]",
    "avatar_url": "https://localhost:3000/avatars/1",
    "username": "gitea"
  },
  "sender": {
    "id": 1,
    "login": "gitea",
    "full_name": "Gitea",
    "email": "[email protected]",
    "avatar_url": "https://localhost:3000/avatars/1",
    "username": "gitea"
  }
}';

$array = json_decode($json, true);
//var_dump($array);
if(array_key_exists('commits', $array)){
    foreach($array['commits'] as $comit){
    var_dump($comit['message']); // powinno zwrócić string(13) "Webhooks Yay!"
    }
}
else{
    echo 'w response nie ma commitów';
}