删除PHP中关联数组的重复元素 [英] Remove duplicated elements of associative array in PHP

问题描述

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

如果是重复的去掉，结果如下:

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

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

有人知道这样做吗?

谢谢

推荐答案

不管其他人在这里提供什么，您都在寻找一个名为 的函数array_unique^文档.这里重要的是将第二个参数设置为 SORT_REGULAR 然后工作就很简单了:

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:

array_unique($result, SORT_REGULAR);

SORT_REGULAR 标志的含义是:

正常比较项目(不要改变类型)

compare items normally (don't change types)

这就是你想要的.您想在此处比较数组^Docs 并且不更改它们类型为字符串(如果未设置参数，这将是默认值).

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).

array_unique 进行严格比较(PHP 中的===)，对于数组，这意味着:

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

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

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

输出(演示):

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

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

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