PHP总结两个键具有相同值的数组条目 [英] PHP sum up array entries where two keys have the same value
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问题描述
我有以下数组,其中我想对源和目标相同的所有条目的total_volume求和。
I have the following array, in which I want to sum up the total_volume for all entries where the source and the target are the same.
Array (
[0] => Array
(
[source] => ABC
[target] => DEF
[total_volume] => 10
)
[1] => Array
(
[source] => ABC
[target] => GHI
[total_volume] => 5
)
[2] => Array
(
[source] => ABC
[target] => DEF
[total_volume] => 5
)
)
结果数组应如下所示:
ResultArray (
[0] => Array
(
[source] => ABC
[target] => DEF
[total_volume] => 15
)
[1] => Array
(
[source] => ABC
[target] => GHI
[total_volume] => 5
)
)
我首先想到的是通过现有数组,并通过ResultArray上的嵌套循环检查是否已存在具有匹配的源-目标对的条目。
My first thought would be to llop through the existing array and check via a nested loop over the ResultArray whether an entry with the matching source-target-pair already exists.
还有另一种使用array_walk()或
Is there an other way using array_walk() or a similar method?
提前感谢您的帮助!
推荐答案
不是很漂亮,但是这里是我如何使用嵌套的foreach来做到这一点;
not pretty but heres how I would do it with a nested foreach;
$aStartingArray = array();
$aStartingArray[] = array('source'=>'ABC', 'target' => 'DEF', 'total_volume' => 10);
$aStartingArray[] = array('source'=>'ABC', 'target' => 'GHI', 'total_volume' => 5);
$aStartingArray[] = array('source'=>'ABC', 'target' => 'DEF', 'total_volume' => 5);
$aSortedArray = array();
foreach ($aStartingArray as $aArray) {
$bSet = false;
foreach ($aSortedArray as $iPos => $aTempSortedArray) {
if(
$aTempSortedArray['source'] == $aArray['source'] &&
$aTempSortedArray['target'] == $aArray['target']){
$aSortedArray[$iPos]['total_volume'] += $aArray['total_volume'];
$bSet = true;
}
}
if(!$bSet) {
$aSortedArray[] = array(
'source' => $aArray['source'],
'target' => $aArray['target'],
'total_volume' => $aArray['total_volume']
);
}
}
var_dump($aSortedArray);
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