尝试使用 array_unique 和 array_values 从 JSON 数组中删除重复项

Question

我一直在关注这个，但它仍然对我不起作用：How to remove duplicate data of JSON object using PHP

在我的 PHP 文件中，我有 3 个 JSON arrays：

{"results":[{"cat_id":2,"cat_name":"veterinarian"},{"cat_id":3,"cat_name":"electrician"},
{"cat_id":4,"cat_name":"dentist"}]}

数组2：

 {"results":[{"cat_id":"8","cat_name":"dental hygienist"},{"cat_id":"5","cat_name":"stocktaker"},
{"cat_id":"9","cat_name":"builder"}]}

数组3：

{"results":[{"cat_id":4,"cat_name":"dentist"},{"cat_id":5,"cat_name":"stocktaker"},
{"cat_id":3,"cat_name":"electrician"}]}

我想合并这些并删除重复项。我正在尝试这样：

//this works good, all merged into one
$array1AndArray2AndArray3 = array_merge_recursive($array1,$array2, $array3);

//now I want to remove duplicates:
$uniqueArray = array_values(array_unique($array1AndArray2AndArray3, SORT_REGULAR));

echo "Unique array is " . json_encode($uniqueArray);

但我得到了：

Unique array is [[{"cat_id":2,"cat_name":"veterinarian"},{"cat_id":3,"cat_name":"electrician"},
{"cat_id":4,"cat_name":"dentist"},
{"cat_id":"8","cat_name":"dental hygienist"},{"cat_id":"5","cat_name":"stocktaker"},
{"cat_id":"9","cat_name":"builder"},
{"cat_id":4,"cat_name":"dentist"},
{"cat_id":5,"cat_name":"stocktaker"},
{"cat_id":3,"cat_name":"electrician"}]]

如您所见，没有删除重复项，并且缺少额外的 [] 和 "results"。

你能告诉我如何解决这个问题，或者其他方法吗？

Answer 1

使用以下解决方案

$array1 = '{"results":[{"cat_id":2,"cat_name":"veterinarian"},{"cat_id":3,"cat_name":"electrician"},{"cat_id":4,"cat_name":"dentist"}]}';
$array2 = '{"results":[{"cat_id":"8","cat_name":"dental hygienist"},{"cat_id":"5","cat_name":"stocktaker"},{"cat_id":"9","cat_name":"builder"}]}';
$array3 = '{"results":[{"cat_id":4,"cat_name":"dentist"},{"cat_id":5,"cat_name":"stocktaker"},{"cat_id":3,"cat_name":"electrician"}]}';

$array1 =  json_decode($array1, TRUE);
$array2 =  json_decode($array2, TRUE);
$array3 =  json_decode($array3, TRUE);

$array4 = array_merge_recursive($array1['results'], $array2['results'], $array3['results']);

$uniqueArray['results'] = array_values(array_unique($array4, SORT_REGULAR));