从多维数组中按嵌套数组键移除重复的嵌套数组。

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英文:

Remove Duplicate Nested Arrays From Multidimenssional Array By Nested Array Key

问题

我试图创建一个数组，在这个数组中，我需要使用特定的键（fileid）进行过滤，以便只返回父数组的唯一键。以下是我的代码：

  1. Array
  2. (
  3.     [ABCD] => Array
  4.         (
  5.             [0] => Array
  6.                 (
  7.                     [fileid] => 5454554
  8.                     [filename] => myfile1.txt
  9.                 )
  11.             [1] => Array
  12.                 (
  13.                     [fileid] => 5454954
  14.                     [filename] => myfile2.txt
  15.                 )
  17.             [2] => Array
  18.                 (
  19.                     [fileid] => 5454554
  20.                     [filename] => myfile1.txt
  21.                 )
  22.         )
  23.     
  24.     [EFGH] => Array
  25.         (
  26.             [0] => Array
  27.                 (
  28.                     [fileid] => 5429654
  29.                     [filename] => myfile2.txt
  30.                 )
  32.             [1] => Array
  33.                 (
  34.                     [fileid] => 5433954
  35.                     [filename] => myfile2.txt
  36.                 )
  38.             [2] => Array
  39.                 (
  40.                     [fileid] => 5429654
  41.                     [filename] => myfile1.txt
  42.                 )
  43.         )
  44. )

第一层键（ABCD和EFGH）是文件所有者的ID。嵌套的数组包含文件ID和文件名。我需要对它进行过滤，以删除每个重复的嵌套数组（具有相同的fileid）。

我尝试了以下方法链接1和链接2，以及在网上找到的许多其他解决方案。但都没有成功。我还尝试了以下代码：

  1. $result =  array_map("unserialize", array_unique(array_map("serialize", $file_array)));

但仍然没有成功。请问有人可以指导我走向正确的方向吗？

先感谢您。

英文:

I am trying to create an array where I need to filter with a certain key (fileid) so that it returns only unique keys for parent array. Here is what I have..

  1. Array
  2. (
  3. 	[ABCD] => Array
  4. 		(
  5. 			[0] => Array
  6. 				(
  7. 					[fileid] => 5454554
  8. 					[filename] => myfile1.txt
  9. 				)
  11. 			[1] => Array
  12. 				(
  13. 					[fileid] => 5454954
  14. 					[filename] => myfile2.txt
  15. 				)
  17. 			[2] => Array
  18. 				(
  19. 					[fileid] => 5454554
  20. 					[filename] => myfile1.txt
  21. 				)
  23. 		)
  25. 	[EFGH] => Array
  26. 		(
  27. 			[0] => Array
  28. 				(
  29. 					[fileid] => 5429654
  30. 					[filename] => myfile2.txt
  31. 				)
  33. 			[1] => Array
  34. 				(
  35. 					[fileid] => 5433954
  36. 					[filename] => myfile2.txt
  37. 				)
  39. 			[2] => Array
  40. 				(
  41. 					[fileid] => 5429654
  42. 					[filename] => myfile1.txt
  43. 				)
  45. 		)
  47. )

The first keys (ABCD and EFGH) are File Owner IDs. The nested arrays contains the File ID and the FIle Name. I need to filter it so that every duplicate nested array (having same fileid) is removed.

I tried this this and this and many other solutions found on the web. But no luck. I also tried

  1. $result =  array_map("unserialize", array_unique(array_map("serialize", $file_array)));

No Luck again. Can someone please guide me to the right direction?

Thanks in advance.

答案1

得分: 2

以下是翻译好的部分：

A simple couple of loops where you remember the fileid's that you have seen in the inner array. If you see a fileid twice, you unset that occurrence of the array.
Note using &$owners in the outer loop so you can actually remove an occurrence from within the foreach loop

一个简单的循环，其中您记住了内部数组中已经看到的fileid。如果您看到一个fileid两次，就取消设置数组中的那个出现。请注意，在外部循环中使用&$owners，这样您可以实际上从foreach循环内部删除一个出现。

RESULT

结果

OR

或者

Build a new array containing only the non-duplicated files

构建一个只包含不重复文件的新数组

代码部分未翻译。

英文:

A simple couple of loops where you remember the fileid's that you have seen in the inner array. If you see a fileid twice, you unset that occurance of the array.
Note using &$owners in the outer loop so you can actually remove an occurance from within the foreach loop

  1. $input = [  'ABCD' => [
  2.                     ['fileid' => 5454554, 'filename' => 'myfile1.txt'],
  3.                     ['fileid' => 5454954, 'filename' => 'myfile2.txt'],
  4.                     ['fileid' => 5454554, 'filename' => 'myfile1.txt']
  5.                     ],
  6.             'EFGH' => [
  7.                     ['fileid' => 5429654, 'filename' => 'myfile2.txt'],
  8.                     ['fileid' => 5433954, 'filename' => 'myfile2.txt'],
  9.                     ['fileid' => 5429654, 'filename' => 'myfile1.txt']
  10.             ]
  11. ];
  12. foreach ($input as &$owners){
  13.     $ids = [];
  14.     foreach($owners as $i=>$file){
  15.         if ( in_array($file['fileid'], $ids) ){
  16.             unset($owners[$i]);
  17.         } else {
  18.             $ids[] = $file['fileid'];
  19.         }
  20.     }
  21. }
  22. print_r($input);

RESULT

  1. Array
  2. (
  3.     [ABCD] => Array
  4.         (
  5.             [0] => Array
  6.                 ( [fileid] => 5454554, [filename] => myfile1.txt )
  8.             [1] => Array
  9.                 ( [fileid] => 5454954, [filename] => myfile2.txt )
  10.         )
  11.     [EFGH] => Array
  12.         (
  13.             [0] => Array
  14.                 ( [fileid] => 5429654, [filename] => myfile2.txt )
  16.             [1] => Array
  17.                 ( [fileid] => 5433954,  [filename] => myfile2.txt )
  18.         )
  19. )

OR

Build a new array containing only the non duplicated files

  1. $input = [  'ABCD' => [
  2.                     ['fileid' => 5454554, 'filename' => 'myfile1.txt'],
  3.                     ['fileid' => 5454954, 'filename' => 'myfile2.txt'],
  4.                     ['fileid' => 5454554, 'filename' => 'myfile1.txt']
  5.                     ],
  6.             'EFGH' => [
  7.                     ['fileid' => 5429654, 'filename' => 'myfile2.txt'],
  8.                     ['fileid' => 5433954, 'filename' => 'myfile2.txt'],
  9.                     ['fileid' => 5429654, 'filename' => 'myfile1.txt']
  10.             ]
  11. ];
  12. $new = [];
  13. foreach ($input as $owner => $files){
  14.     $t = [];
  15.     $ids = [];
  17.     foreach($files as $i=>$file){
  18.         if ( ! in_array($file['fileid'], $ids) ){
  19.             $t[] = $file;
  20.             $ids[] = $file['fileid'];
  21.         }
  22.     }
  23.     $new[$owner] = $t;
  24. }
  25. print_r($new);

答案2

得分: 1

你可以使用array_map和array_filter的组合，如下所示：

  1. array_map(
  2.     function($arr) {
  3.         $exists = [];
  4.         return array_values(
  5.             array_filter(
  6.                 $arr,
  7.                 function($arr1) use (&$exists) {
  8.                     if (isset($exists[$arr1['fileid']])) {
  9.                         return false;
  10.                     }
  11.                     $exists[$arr1['fileid']] = true;
  12.                     return true;
  13.                 }
  14.             )
  15.         );
  16.     },
  17.     $file_array
  18. );

注意：我使用了array_values来确保结果数组具有连续的数值键。如果你想保留原始的数值键，可以省略它。

英文:

You can use a combination of array_map and array_filter like so:

  1. array_map(
  2. 	function($arr) {
  3. 		$exists = [];
  4. 		return array_values(
  5. 			array_filter(
  6. 				$arr,
  7. 				function($arr1) use (&$exists) {
  8. 					if (isset($exists[$arr1['fileid']])) {
  9. 						return false;
  10. 					}
  11. 					$exists[$arr1['fileid']] = true;
  12. 					return true;
  13. 				}
  14. 			)
  15. 		);
  16. 	},
  17. 	$file_array,
  18. );

Note: I used array_values to ensure the resultant array has consecutive numerical keys. If you want to keep the original numerical keys then it can be omitted.

huangapple
  • 本文由 发表于 2023年3月3日 22:58:22
  • 转载请务必保留本文链接：https://go.coder-hub.com/75628629.html
  • array-filter
  • array-unique
  • arrays
  • multidimensional-array
  • php
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