問題描述

我在溢出和谷歌上做了很多環(huán)顧四周，但沒有一個結果適用于我的具體情況.

I have done a lot of looking around on the overflow, and on google, but none of the results works for my specific case.

我有一個名為 $holder 的占位符數(shù)組，值如下:

I have a placeholder array called $holder, values as follows:

    Array ( 
    [0] => Array ( 
        [id] => 1 
        [pid] => 121 
        [uuid] => 1  
        )
    [1] => Array ( 
        [id] => 2 
        [pid] => 13
        [uuid] => 1
        )
    [2] => Array ( 
        [id] => 5 
        [pid] => 121 
        [uuid] => 1
        )
    ) 

我試圖從這個多維數(shù)組中提取不同/唯一的值.我想要的最終結果是一個包含 (13,121) 的變量，或者(最好)一個數(shù)組，如下所示:大批([0] => 13[1] => 121)

I am trying to pull out distinct/unique values from this multidimensional array. The end result I would like is either a variable containing (13,121), or (preferrably) an array as follows: Array( [0] => 13 [1] => 121 )

我再次嘗試序列化等，但不太明白在每個數(shù)組中使用單個鍵操作時它是如何工作的.

Again I've tried serializing and such, but don't quite understand how that works when operating with a single key in each array.

我盡量說清楚.我希望這是有道理的...

I tried to be as clear as possible. I hope it makes sense...

推薦答案

看起來很簡單:將所有 pid 值提取到自己的數(shù)組中，通過 array_unique 運行:

Seems pretty simple: extract all pid values into their own array, run it through array_unique:

$uniquePids = array_unique(array_map(function ($i) { return $i['pid']; }, $holder));

同樣的東西:

$pids = array();
foreach ($holder as $h) {
    $pids[] = $h['pid'];
}
$uniquePids = array_unique($pids);

這篇關于如何在多維數(shù)組中獲取唯一值的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！