Tagging friends on facebook Via Graphs - php

Question

I am Trying to Tag a picture and posting it through graphs However, when I remove the 'tags' => $tags from below, it works. Otherwise I get this error:
Array ( [error] => Array ( [message] => (#100) param tags must be an array. [type] => OAuthException [code] => 100 ) )
Here is my code:
<?php
$tags = array(
'to' => $_SESSION['my_fb_id'],
'x' => 0,
'y' => 0
);
$tag[]= $tags ;
//
//upload photo
$file = 'imgtmp/save_as_this_name.jpg';
$args = array(
'message' => 'This is my Picture',
'tags' => $tag, // IF this line is removed ,It works!
);
$args[basename($file)] = '#' . realpath($file);
$ch = curl_init();
$url = 'https://graph.facebook.com/me/photos?access_token=' . $_SESSION['access_token'];
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $args);
$data = curl_exec($ch);
print_r(json_decode($data, true));
?>

Answer 1

Tags must be array of tags as you can tag many people.
$tag1 = array(
'tag_text' => 'tag test1',
'tag_uid' => 'XXXXX1',
'x' => 0,
'y' => 0
);
$tag2 = array(
'tag_text' => 'tag test2',
'tag_uid' => 'XXXXX2',
'x' => 0,
'y' => 0
);
$tags = array($tag1, $tag2);
In your case
$args = array(
'message' => 'This is my Picture',
'tags' => array( $tags ) ,
);
EDIT 1:
To tag photos successfully you will require user_photos permission.
Using graph api
$file = 'test.jpg';
$tags = array(
'tag_text' => 'tag test',
'tag_uid' => 'XXXXX',
'x' => 10,
'y' => 10
);
$args['tags'] = array($tags);
$args[basename($file)] = '#' . realpath($file);
$data = $facebook->api("/me/photos", "post", $args);
print_r($data);
Edit 2:
Just use json_encode for tags parameter
$args['tags'] = json_encode(array($tags));
This will solve the issue while using cURL.

Answer 2

Alright I got it. From the Facebook API:
"tags": {
"data": [
{
"id": "11111111111111",
"name": "John Doe",
"x": 0,
"y": 0,
"created_time": "2012-09-03T03:08:44+0000"
}
]
},
The tags arg needs to contain an array with data as the key. Here:
$tags['data'] = array(
'to' => $_SESSION['my_fb_id'],
'x' => 0,
'y' => 0 );