Remove duplicate values ​​from multidimensional array

Suitable for merging arrays and removing duplicate arrays. Mark yourself
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$json='{

 "rec_items": [
 {
 "classes": "Fantasy",
 "gid": 6326585,
 "author": "I eat tomatoes",
 "nid": 10079306,
 "last_sort": 841,
 "last_chapter_name": "Chapter 6 of Volume 25 Swept Away",
 "sub_count": 5364424,
 "novel_name": "The Wilderness ",
 "last_update_time": 1393679718826
 },
 {
 "classes": "Fantasy",
 "gid": 6109786,
 "author": "Tang Jia San Shao",
 "nid": 10079046,
 "last_sort" : 1153,
 "last_chapter_name": "Chapter 381 Begins Action (Part 2)",
 "sub_count": 3933876,
 "novel_name": "Peerless Tang Sect",
 "last_update_time": 1393681654511
 },
 {
 "classes": "Fantasy",
 "gid": 10645516,
 "author": "Chen Dong",
 "nid": 12649548,
 "last_sort": 478,
 "last_chapter_name": "Fourth Chapter 132: Carrying the Wife Back to the Village",
 "sub_count": 1422482,
 "novel_name": "Perfect World",
 "last_update_time": 1393681655610
 },
 {
 "classes": "Fantasy",
 " gid": 4711723,
 "author": "Just a little shrimp",
 "nid": 12629406,
 "last_sort": 2603,
 "last_chapter_name": "Chapter 2588 Wake up! ",
 "sub_count": 2841630,
 "novel_name": "武Ni",
 "last_update_time": 1393605899300
 },
 {
 "classes": "fantasy",
 "gid": 3701669,
 "author" : "Cang Xiaotian",
 "nid": 8583556,
 "last_sort": 3427,
 "last_chapter_name": "Chapter 2225 The Peacock King! ",
 "sub_count": 606473,
 "novel_name": "武波九鄄",
 "last_update_time": 1391279170831
 },
 {
 "classes": "fantasy",
 "gid": 8141499,
 "author ": "Feng Ling Tian Xia",
 "nid": 9212380,
 "last_sort": 2579,
 "last_chapter_name": "Chapter 526 Nine Tribulations, Battle of the Emperor of Heaven [Seven]",
 "sub_count" : 3082857, 2 "NOVEL_NAME": "Ao Shi Nine Heaven",
 "Last_update_time": 1393677692614
}
],
 "Cate_Book_items": [
 {
 "" fantasy ",
" gid ": 47777 11723,, "author": "Just a little shrimp",
 "nid": 12629406,
 "last_sort": 2603,
 "last_chapter_name": "Chapter 2588 Wake up! ",
 "sub_count": 2841630,
 "novel_name": "武Ni",
 "last_update_time": 1393605899300
 },
 {
 "classes": "fantasy",
 "gid": 3701669,
 "author" : "Cang Xiaotian",
 "nid": 8583556,
 "last_sort": 3427,
 "last_chapter_name": "Chapter 2225 The Peacock King!",
 "sub_count": 606473,
 "novel_name": "武波九鄄",
 "last_update_time": 1391279170831
 },
 {
 "classes": "Fantasy",
 "gid": 10645516,
 "author ": "Chen Dong",
 "nid": 12649548,
 "last_sort": 478,
 "last_chapter_name": "Chapter 432 Carrying the Wife Back to the Village",
 "sub_count": 1422482,
 "novel_name ": "Perfect World",
 "last_update_time": 1393681655610
 }
 ]
}';

function mult_unique($array)
{
 $return = array();
 foreach($array as $key=> $v)
 {
 if(!in_array($v, $return))
 {
 $return[$key]=$v;
 }
 }
 return $return;
}

$json = get_object_vars(json_decode ($json));
$data = $json['rec_items'];
$data = array_merge_recursive($data, $json['cate_book_items']);

echo '';</li>
<li>print_r($ data);</li>
<li>echo '<br>';</li>
<li>print_r(mult_unique($data));</li>
<li>echo '';
?>