多次元配列から重複した値を削除します

配列の結合や重複した配列の削除に適しています。 自分にマークを付けてください
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$json='{

 "rec_items": [
 {
 "classes": "ファンタジー",
 "gid": 6326585,
 "author": "私はトマトを食べる",
 "nid": 10079306,
 "last_sort": 841,
 "last_chapter_name": "第 25 巻第 6 章一掃",
 "sub_count": 5364424,
 "novel_name": "荒野",
 "last_update_time" : 1393679718826
 },
 {
 "classes": "Fantasy",
 "gid": 6109786,
 "author": "Tang Jia San Shao",
 "nid": 10079046,
 "last_sort" : 1153,
 "last_chapter_name": "第 381 章 行動開始 (パート 2)",
 "sub_count": 3933876,
 "novel_name": "比類のない唐宗派",
 "last_update_time": 1393681654511
 },
 {
 "classes": " Fantasy",
 "gid": 10645516,
 "author": "Chen Dong",
 "nid": 12649548,
 "last_sort": 478,
 "last_chapter_name": "第 4 章 132: 妻を家に運ぶVillage",
 "sub_count": 1422482,
 "novel_name": "パーフェクト ワールド",
 "last_update_time": 1393681655610
 },
 {
 "classes": "ファンタジー",
 " gid": 4711723,
 "author ": "ちょっとエビ",
 "nid": 12629406,
 "last_sort": 2603,
 "last_chapter_name": "第 2588 章 目覚めよ！ ",
 "sub_count": 2841630,
 "novel_name": "武Ni",
 "last_update_time": 1393605899300
 },
 {
 "classes": "ファンタジー",
 "gid": 3701669,
 "author" : "Cang Xiaotian",
 "nid": 8583556,
 "last_sort": 3427,
 "last_chapter_name": "第 2225 章 孔雀王! ",
 "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": "第 526 章 九つの艱難、天帝の戦い [7]",
 "sub_count" : 3082857, 2 "NOVEL_NAME": "青紫九天",
 "Last_update_time": 1393677692614
}
],
 "Cate_Book_items": [
 {
 "" ファンタジー ",
 " gid ": 4777 11723,, " author": "ちょっとエビ",
 "nid": 12629406,
 "last_sort": 2603,
 "last_chapter_name": "第 2588 章 目覚めよ！ ",
 "sub_count": 2841630,
 "novel_name": "武Ni",
 "last_update_time": 1393605899300
 },
 {
 "classes": "ファンタジー",
 "gid": 3701669,
 "author" : "Cang Xiaotian",
 "nid": 8583556,
 "last_sort": 3427,
 "last_chapter_name": "第 2225 章 孔雀王!",
 "sub_count": 606473,
 "novel_name": "武波九鄄",
 "last_update_time": 1391279170831
 },
 {
 "classes": "Fantasy",
 "gid": 10645516,
 " author ": "チェンドン",
 "nid": 12649548,
 "last_sort": 478,
 "last_chapter_name": "第 432 章 妻を村に連れて帰る",
 "sub_count": 1422482,
 "novel_name " : "パーフェクト ワールド",
 "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 '';
?>