在PHP中删除关联数组的重复元素

$result = array(
    0=>array('a'=>1,'b'=>'Hello'),
    1=>array('a'=>1,'b'=>'other'),
    2=>array('a'=>1,'b'=>'other'),
);

If it is duplicated removed it, so the result is as follows:

如果重复删除它，那么结果如下：

$result = array(
    0=>array('a'=>1,'b'=>'Hello'),
    1=>array('a'=>1,'b'=>'other')   
);

Could any know to do this?

有谁知道这样做？

Thanks

谢谢

2 个解决方案

#1

Regardless what others are offering here, you are looking for a function called array_unique^Docs. The important thing here is to set the second parameter to SORT_REGULAR and then the job is easy:

无论其他人在这里提供什么，您正在寻找一个名为array_uniqueDocs的函数。这里重要的是将第二个参数设置为SORT_REGULAR，然后工作很简单：

array_unique($result, SORT_REGULAR);

The meaning of the SORT_REGULAR flag is:

SORT_REGULAR标志的含义是：

compare items normally (don't change types)

通常比较项目（不要更改类型）

And that is what you want. You want to compare arrays^Docs here and do not change their type to string (which would have been the default if the parameter is not set).

这就是你想要的。您想要在这里比较arraysDocs并且不要将它们的类型更改为字符串（如果未设置参数，则默认为默认值）。

array_unique does a strict comparison (=== in PHP), for arrays this means:

array_unique进行严格的比较（在PHP中为===），对于数组，这意味着：

$a === $b TRUE if $a and $b have the same key/value pairs in the same order and of the same types.

$ a === $ b如果$ a和$ b具有相同顺序和相同类型的相同键/值对，则为TRUE。

Output (Demo):

输出（演示）：

Array
(
    [0] => Array
        (
            [a] => 1
            [b] => Hello
        )

    [1] => Array
        (
            [a] => 1
            [b] => other
        )
)

#2

First things first, you can not use plain array_unique for this problem because array_unique internally treats the array items as strings, which is why "Cannot convert Array to String" notices will appear when using array_unique for this.

首先，你不能使用plain array_unique来解决这个问题，因为array_unique在内部将数组项视为字符串，这就是为什么在使用array_unique时会出现“无法将数组转换为字符串”的注意事项。

So try this:

所以试试这个：

$result = array(
    0=>array('a'=>1,'b'=>'Hello'),
    1=>array('a'=>1,'b'=>'other'),
    2=>array('a'=>1,'b'=>'other')
);

$unique = array_map("unserialize", array_unique(array_map("serialize", $result)));

print_r($unique);

Result:

结果：

Array
(
    [0] => Array
        (
            [a] => 1
            [b] => Hello
        )

    [1] => Array
        (
            [a] => 1
            [b] => other
        )

)

Serialization is very handy for such problems.

序列化对于这些问题非常方便。

If you feel that's too much magic for you, check out this blog post

如果您觉得这对您来说太神奇了，请查看此博文

function array_multi_unique($multiArray){

  $uniqueArray = array();

  foreach($multiArray as $subArray){

    if(!in_array($subArray, $uniqueArray)){
      $uniqueArray[] = $subArray;
    }
  }
  return $uniqueArray;
}

$unique = array_multi_unique($result);

print_r($unique);

Ironically, in_array is working for arrays, where array_unique does not.

具有讽刺意味的是，in_array适用于数组，其中array_unique不支持。

#1