Question

在类别概述中，我需要总结所有子类别中研究的所有项目。

我在foreach（）中有一个函数countitemsinsubcat（），它为每个子类别（$ id_cat）返回一个数组'$ value'。

foreach ($subcategory as $row) {
    $value =& countitemsinsubcat($id_cat);

    $all_values_found [] = $value; 
}

对于包含2个子类别的类别，这些是$ all_values_found：

Array (
   [0] => Array(
     [Istudied] => 0
     [Itotal] => 1
    )

[1] => Array (
    [Istudied] => 1
    [Itotal] => 4
    )
)

在类别概述中，我想总结每个子类别的数组的值，并得到一个'总'数组，如下所示：

Array
(
            [Istudied] => 1
            [Itotal] => 5
)

有关如何做的任何建议？

Answer 1

看一下这段代码[PHP]：

//The magic happens here:

function concatit($v, $w)
{
    $v[Istudied] += $w[Istudied];
    $v[Itotal] += $w[Itotal];
    return $v;
}

//Declaring the array.

$a = array (array(
        Istudied => 0,
        Itotal => 1
    ),array (
        Istudied => 1,
        Itotal => 4
    )
);

//Making a call to the 'concatit' function declared above from within array_reduce.

$d = array_reduce($a, "concatit");

//Now $d contains the array as you wanted it.

echo $d[Istudied].' '.$d[Itotal];

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从foreach返回数组并将它们的值相加

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