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：
Array
(
[ABCD] => Array
(
[0] => Array
(
[fileid] => 5454554
[filename] => myfile1.txt
)
[1] => Array
(
[fileid] => 5454954
[filename] => myfile2.txt
)
[2] => Array
(
[fileid] => 5454554
[filename] => myfile1.txt
)
)
[EFGH] => Array
(
[0] => Array
(
[fileid] => 5429654
[filename] => myfile2.txt
)
[1] => Array
(
[fileid] => 5433954
[filename] => myfile2.txt
)
[2] => Array
(
[fileid] => 5429654
[filename] => myfile1.txt
)
)
)
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：
$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..
Array
(
[ABCD] => Array
(
[0] => Array
(
[fileid] => 5454554
[filename] => myfile1.txt
)
[1] => Array
(
[fileid] => 5454954
[filename] => myfile2.txt
)
[2] => Array
(
[fileid] => 5454554
[filename] => myfile1.txt
)
)
[EFGH] => Array
(
[0] => Array
(
[fileid] => 5429654
[filename] => myfile2.txt
)
[1] => Array
(
[fileid] => 5433954
[filename] => myfile2.txt
)
[2] => Array
(
[fileid] => 5429654
[filename] => myfile1.txt
)
)
)
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
$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
$input = [ 'ABCD' => [
['fileid' => 5454554, 'filename' => 'myfile1.txt'],
['fileid' => 5454954, 'filename' => 'myfile2.txt'],
['fileid' => 5454554, 'filename' => 'myfile1.txt']
],
'EFGH' => [
['fileid' => 5429654, 'filename' => 'myfile2.txt'],
['fileid' => 5433954, 'filename' => 'myfile2.txt'],
['fileid' => 5429654, 'filename' => 'myfile1.txt']
]
];
foreach ($input as &$owners){
$ids = [];
foreach($owners as $i=>$file){
if ( in_array($file['fileid'], $ids) ){
unset($owners[$i]);
} else {
$ids[] = $file['fileid'];
}
}
}
print_r($input);
RESULT
Array
(
[ABCD] => Array
(
[0] => Array
( [fileid] => 5454554, [filename] => myfile1.txt )
[1] => Array
( [fileid] => 5454954, [filename] => myfile2.txt )
)
[EFGH] => Array
(
[0] => Array
( [fileid] => 5429654, [filename] => myfile2.txt )
[1] => Array
( [fileid] => 5433954, [filename] => myfile2.txt )
)
)
OR
Build a new array containing only the non duplicated files
$input = [ 'ABCD' => [
['fileid' => 5454554, 'filename' => 'myfile1.txt'],
['fileid' => 5454954, 'filename' => 'myfile2.txt'],
['fileid' => 5454554, 'filename' => 'myfile1.txt']
],
'EFGH' => [
['fileid' => 5429654, 'filename' => 'myfile2.txt'],
['fileid' => 5433954, 'filename' => 'myfile2.txt'],
['fileid' => 5429654, 'filename' => 'myfile1.txt']
]
];
$new = [];
foreach ($input as $owner => $files){
$t = [];
$ids = [];
foreach($files as $i=>$file){
if ( ! in_array($file['fileid'], $ids) ){
$t[] = $file;
$ids[] = $file['fileid'];
}
}
$new[$owner] = $t;
}
print_r($new);
答案2
得分: 1
你可以使用array_map和array_filter的组合，如下所示：
array_map(
function($arr) {
$exists = [];
return array_values(
array_filter(
$arr,
function($arr1) use (&$exists) {
if (isset($exists[$arr1['fileid']])) {
return false;
}
$exists[$arr1['fileid']] = true;
return true;
}
)
);
},
$file_array
);
注意：我使用了array_values来确保结果数组具有连续的数值键。如果你想保留原始的数值键，可以省略它。
英文:
You can use a combination of array_map and array_filter like so:
array_map(
function($arr) {
$exists = [];
return array_values(
array_filter(
$arr,
function($arr1) use (&$exists) {
if (isset($exists[$arr1['fileid']])) {
return false;
}
$exists[$arr1['fileid']] = true;
return true;
}
)
);
},
$file_array,
);
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.
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