php 如何从PHP中的多维数组中删除重复值
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How to remove duplicate values from a multi-dimensional array in PHP
提问by Ian
How can I remove duplicate values from a multi-dimensional array in PHP?
如何从 PHP 中的多维数组中删除重复值？
Example array:
示例数组：
Array
(
[0] => Array
(
[0] => abc
[1] => def
)
[1] => Array
(
[0] => ghi
[1] => jkl
)
[2] => Array
(
[0] => mno
[1] => pql
)
[3] => Array
(
[0] => abc
[1] => def
)
[4] => Array
(
[0] => ghi
[1] => jkl
)
[5] => Array
(
[0] => mno
[1] => pql
)
)
回答by daveilers
Here is another way. No intermediate variables are saved.
这是另一种方式。不保存中间变量。
We used this to de-duplicate results from a variety of overlapping queries.
我们使用它从各种重叠查询中删除重复结果。
$input = array_map("unserialize", array_unique(array_map("serialize", $input)));
回答by Ja?ck
Since 5.2.9 you can use array_unique()if you use the SORT_REGULARflag like so:
从 5.2.9 开始，array_unique()如果您SORT_REGULAR像这样使用标志，则可以使用：
array_unique($array, SORT_REGULAR);
This makes the function compare elements for equality as if $a == $bwere being used, which is perfect for your case.
这使得函数比较元素的相等性就好像$a == $b正在使用一样，这非常适合您的情况。
Output
输出
Array
(
[0] => Array
(
[0] => abc
[1] => def
)
[1] => Array
(
[0] => ghi
[1] => jkl
)
[2] => Array
(
[0] => mno
[1] => pql
)
)
Keep in mind, though, that the documentationstates:
但请记住，文档指出：
array_unique()is not intended to work on multi dimensional arrays.
array_unique()不适用于多维数组。
回答by Rajendrasinh
I had a similar problem but I found a 100% working solution for it.
我有一个类似的问题，但我找到了一个 100% 有效的解决方案。
<?php
function super_unique($array,$key)
{
$temp_array = [];
foreach ($array as &$v) {
if (!isset($temp_array[$v[$key]]))
$temp_array[$v[$key]] =& $v;
}
$array = array_values($temp_array);
return $array;
}
$arr="";
$arr[0]['id']=0;
$arr[0]['titel']="ABC";
$arr[1]['id']=1;
$arr[1]['titel']="DEF";
$arr[2]['id']=2;
$arr[2]['titel']="ABC";
$arr[3]['id']=3;
$arr[3]['titel']="XYZ";
echo "<pre>";
print_r($arr);
echo "unique*********************<br/>";
print_r(super_unique($arr,'titel'));
?>
回答by OIS
Another way. Will preserve keys as well.
其它的办法。也将保留密钥。
function array_unique_multidimensional($input)
{
$serialized = array_map('serialize', $input);
$unique = array_unique($serialized);
return array_intersect_key($input, $unique);
}
回答by Jeremy Ruten
The user comments on the array_unique()documentation have many solutions to this. Here is one of them:
用户对array_unique()文档的评论对此有很多解决方案。这是其中之一：
kenrbnsn at rbnsn dot com
27-Sep-2005 12:09Yet another Array_Unique for multi-demensioned arrays. I've only tested this on two-demensioned arrays, but it could probably be generalized for more, or made to use recursion.
This function uses the serialize, array_unique, and unserialize functions to do the work.
function multi_unique($array) { foreach ($array as $k=>$na) $new[$k] = serialize($na); $uniq = array_unique($new); foreach($uniq as $k=>$ser) $new1[$k] = unserialize($ser); return ($new1); }
kenrbnsn 在 rbnsn dot com
27-Sep-2005 12:09另一个 Array_Unique 用于多维数组。我只在二维数组上测试过这个，但它可能会被推广到更多，或者使用递归。
该函数使用 serialize、array_unique 和 unserialize 函数来完成这项工作。
function multi_unique($array) { foreach ($array as $k=>$na) $new[$k] = serialize($na); $uniq = array_unique($new); foreach($uniq as $k=>$ser) $new1[$k] = unserialize($ser); return ($new1); }
This is from http://ca3.php.net/manual/en/function.array-unique.php#57202.
这是来自http://ca3.php.net/manual/en/function.array-unique.php#57202。
回答by automatix
If "remove duplicates" means "remove duplicates, but let one there", a solution might be to apply the array_unique(...)on the "identifier column" first and then to remove in the original array all the keys, that have been removed from the column array:
如果“删除重复项”的意思是“删除重复项，但保留一个”，则解决方案可能是先array_unique(...)在“标识符列”上应用 ，然后在原始数组中删除所有已从列数组中删除的键：
$array = [
[
'id' => '123',
'foo' => 'aaa',
'bar' => 'bbb'
],
[
'id' => '123',
'foo' => 'ccc',
'bar' => 'ddd'
],
[
'id' => '567',
'foo' => 'eee',
'bar' => 'fff'
]
];
$ids = array_column($array, 'id');
$ids = array_unique($ids);
$array = array_filter($array, function ($key, $value) use ($ids) {
return in_array($value, array_keys($ids));
}, ARRAY_FILTER_USE_BOTH);
The result is:
结果是：
Array
(
[0] => Array
(
[id] => 123
[foo] => aaa
[bar] => bbb
)
[2] => Array
(
[id] => 567
[foo] => eee
[bar] => fff
)
)
回答by Mahak Choudhary
Array
(
[0] => Array
(
[id] => 1
[name] => john
)
[1] => Array
(
[id] => 2
[name] => smith
)
[2] => Array
(
[id] => 3
[name] => john
)
[3] => Array
(
[id] => 4
[name] => robert
)
)
$temp = array_unique(array_column($array, 'name'));
$unique_arr = array_intersect_key($array, $temp);
This will remove the duplicate names from array. unique by key
这将从数组中删除重复的名称。键唯一
回答by anghazi ghermezi
Just use SORT_REGULAR option as second parameter.
只需使用 SORT_REGULAR 选项作为第二个参数。
$uniqueArray = array_unique($array, SORT_REGULAR);
回答by r3wt
if you need to eliminate duplicates on specific keys, such as a mysqli id, here's a simple funciton
如果您需要消除特定键上的重复项，例如 mysqli id，这是一个简单的函数
function search_array_compact($data,$key){
$compact = [];
foreach($data as $row){
if(!in_array($row[$key],$compact)){
$compact[] = $row;
}
}
return $compact;
}
Bonus PointsYou can pass an array of keys and add an outer foreach, but it will be 2x slower per additional key.
奖励积分您可以传递一组键并添加一个外部 foreach，但每个附加键会慢 2 倍。
回答by Anand agrawal
A very easy and logical way to Unique a multi dimension array is as follows,
唯一一个多维数组的一个非常简单和合乎逻辑的方法如下，
If you have array like this:
如果你有这样的数组：
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[2] => Value1
[3] => Value3
[4] => Value1
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[2] => Value1
[3] => Value3
[4] => Value4
)
)
use foreachto solve this:
使用foreach来解决这个问题：
foreach($array as $k=>$v){
$unique=array_unique($v);
$array[$k]=$unique;
}
it will give you following result:
它会给你以下结果：
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[3] => Value3
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[3] => Value3
[4] => Value4
)
)
and if you want to rearrange the order of the keys,
如果你想重新排列键的顺序，
foreach($array as $k=>$v){
$unique= array_values(array_unique($v));
$array[$k]=$unique;
}
This operation will give you arranged key values like this:
此操作将为您提供如下排列的键值：
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[2] => Value3
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[2] => Value3
[3] => Value4
)
)
I hope this will clear everything.
我希望这会清除一切。
