How to convert and use JSON data from a remote Wordpress server?

Question

I got this code

add_action( 'init', 'check_api_data' );

function check_api_data() {    

  if(isset($_GET['api']) ) {
  if ($_GET['api'] == 'json'){
           $args = array(  
                'post_type' => 'post'
           );
           $query = new WP_Query( $args ); // $query is the WP_Query Object
           $posts = $query->get_posts();   // $posts contains the post objects

           $output = array();
           foreach( $posts as $post ) {    // Pluck the id and title attributes
               $output[] = array( 
                'id' => $post->ID, 
                'title' => $post->post_title, 
                'content' => $post ->post_content,
                'imageurl' => wp_get_attachment_url( get_post_thumbnail_id($post->ID) )
                );
           }
           header("Content-type: application/json");
           echo json_encode( $output );
       }
   exit();
   }  
}

This is the output:

[
  {
    "id": 19,
    "title": "Early bird tickets",
    "content": "that is good",
    "imageurl": "http://localhost/PRACTISE/wp/wp-content/uploads/2016/10/news2.jpg"
  },
  {
    "id": 95,
    "title": "See you next year!",
    "content": "Lorem ipsum",
    "imageurl": "http://localhost/PRACTISE/wp/wp-content/uploads/2016/11/tak_for_i_aar.jpg"
  }
]

How can I use this data in a remote server, so that everytime I update my content of Server A it gets updated at Server B

Answer 1

On server B:

$result = wp_remote_post('http://serverA.com/?api=json', array(
    'method'      => 'POST',
    'redirection' => 1,
    'httpversion' => '1.0',
    'blocking'    => true,
    'headers'     => array(),
    'body'        => array(),
    'cookies'     => array()
));
if ( is_wp_error( $result ) ) {
    return 'bad connection!';
}
$json = $result['body'];
$posts = json_decode($json);

Now you have $posts as usual php array. var_dump($posts) will look like:

array(2) {
  [0]=>
  object(stdClass)#7918 (4) {
    ["id"]=>
    int(19)
    ["title"]=>
    string(18) "Early bird tickets"
    ["content"]=>
    string(12) "that is good"
    ["imageurl"]=>
    string(65) "http://localhost/PRACTISE/wp/wp-content/uploads/2016/10/news2.jpg"
  }
  [1]=>
  object(stdClass)#7919 (4) {
    ["id"]=>
    int(95)
    ["title"]=>
    string(18) "See you next year!"
    ["content"]=>
    string(11) "Lorem ipsum"
    ["imageurl"]=>
    string(73) "http://localhost/PRACTISE/wp/wp-content/uploads/2016/11/tak_for_i_aar.jpg"
  }
}