php 如何在多维数组中获取唯一值
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How to get unique value in multidimensional array
提问by MaurerPower
I have done a lot of looking around on the overflow, and on google, but none of the results works for my specific case.
我在溢出和谷歌上做了很多环顾四周，但没有一个结果适用于我的具体情况。
I have a placeholder array called $holder, values as follows:
我有一个名为 $holder 的占位符数组，值如下：
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
)
)
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 )
我试图从这个多维数组中提取不同/唯一的值。我想要的最终结果是一个包含 (13,121) 的变量，或者（最好）一个数组，如下所示： Array( [0] => 13 [1] => 121 )
Again I've tried serializing and such, but don't quite understand how that works when operating with a single key in each array.
我再次尝试序列化等，但不太明白在每个数组中使用单个键操作时它是如何工作的。
I tried to be as clear as possible. I hope it makes sense...
我尽量说清楚。我希望这是有道理的...
回答by deceze
Seems pretty simple: extract all pidvalues into their own array, run it through array_unique:
看起来很简单：将所有pid值提取到他们自己的数组中，运行它array_unique：
$uniquePids = array_unique(array_map(function ($i) { return $i['pid']; }, $holder));
The same thing in longhand:
同样的事情：
$pids = array();
foreach ($holder as $h) {
$pids[] = $h['pid'];
}
$uniquePids = array_unique($pids);
回答by Dondi Imperial
In php >= 5.5 you can use array_column:
在 php >= 5.5 中，您可以使用array_column：
array_unique(array_column($holder, 'pid'));
回答by Jorge Orpinel
Assuming your array is called $holder:
假设您的数组称为 $holder：
$unique = array();
foreach( $holder as $h )
if( ! in_array($h, $unique ) )
$unique[] = $h;
is a slightly more efficient way than via array_unique, I believe. May be the same.
我相信是一种比通过 array_unique 更有效的方法。可能是一样的。
回答by Nauphal
try this
尝试这个
foreach($arr as $key => $val) {
$new_arr[] = $val['pid'];
}
$uniq_arr = array_unique($new_arr);
回答by konsolenfreddy
Just iterate over it and apply an array_uniqueon the result:
只需迭代它并对array_unique结果应用一个：
foreach($holder as $yourValues){
$pids[] = $yourValues['pid'];
}
$yourUniquePids = array_unique($pids);
回答by Er. Anurag Jain
Hi Please try code given below for get unique values and then sort that values
嗨请尝试下面给出的代码以获得唯一值，然后对该值进行排序
<?php
$sort_arr = unique_sort($holder, 'pid');
echo "<pre>";
print_r($sort_arr);
echo"</pre>";
/*function for get unique value then sort them*/
function unique_sort($arrs, $id) {
$unique_arr = array();
foreach ($arrs AS $arr) {
if (!in_array($arr[$id], $unique_arr)) {
$unique_arr[] = $arr[$id];
}
}
sort($unique_arr);
return $unique_arr;
}
thanks
谢谢
回答by Anti logic
$uniquearray = [];
for($i=0;$i<count($assocarray);$i++){
if(!in_array($assocarray[$i]['KEY'],$uniquearray)){
$uniquearray[$i]= $assocarray[$i]['KEY'];
}
}
回答by azwart
fo my situation i use this method
对于我的情况，我使用这种方法
//get some data from db to array
while ($row = mysqli_fetch_assoc($query)){
$data[] = $row;
}
//display unique value
echo "<table>";
$uniq = array();
foreach ($data as $row) {
if(!in_array($row['path'], $uniq)) {
$uniq[] = $row['path'];
echo "<tr>";
echo "<td>";
echo $row['path'];
echo "</td>";
echo "<td>";
echo $row['relationship_id'];
echo "</td>";
echo "</tr>";
}
}
echo "</table>";
