php display only duplicate value from array (facebook api) - php

Question

I want delete duplicate post from array of facebook graph data
my page data like :
{
"data": [
{
"link": "http://example.com/188",
"id": "427801497327797_428375477270399",
"created_time": "2013-06-29T14:16:26+0000"
},
{
"link": "http://example.com/188",
"id": "427801497327797_428375187270428",
"created_time": "2013-06-29T14:15:27+0000"
},
{
"link": "http://example.com/188",
"id": "427801497327797_428363873938226",
"created_time": "2013-06-29T13:33:17+0000"
},
{
"link": "http://example.com/196",
"id": "427801497327797_428363597271587",
"created_time": "2013-06-29T13:32:07+0000"
}
],
"paging": {
"previous": "",
"next": ""
}
}
You can see duplicate link example.com/188.
I want get id of all duplicate link.
I'm working with facebook-page-poster

Answer 1

If your concern is to remove duplicate link data then you can do like this
<?php
$duplicate_ids = array();
$all_links = array();
$facebook_data = array(
'data' => array(
array(
'link' => 'http=>//site.com/188',
'id' => '427801497327797_428375477270399',
'created_time' => '2013-06-29T14=>16=>26+0000'
), array(
'link' => 'http=>//site.com/188',
'id' => '427801497327797_428375187270428',
'created_time' => '2013-06-29T14=>15=>27+0000'
), array(
'link' => 'http=>//site.com/188',
'id' => '427801497327797_428363873938226',
'created_time' => '2013-06-29T13=>33=>17+0000'
), array(
'link' => 'http=>//site.com/196',
'id' => '427801497327797_428363597271587',
'created_time' => '2013-06-29T13=>32=>07+0000'
)
),
'paging' => array(
'previous' => '',
'next' => ''
)
);
$data_count = count($facebook_data['data']);
for ($i = 0; $i < $data_count; $i++) {
if (in_array($facebook_data['data'][$i]['link'], $all_links)) {
$duplicate_ids[] = $facebook_data['data'][$i]['id'];
unset($facebook_data['data'][$i]);
} else {
$all_links[] = $facebook_data['data'][$i]['link'];
}
}
echo '<pre>'; print_r($duplicate_ids); '</pre>';