比较php中的数组并通过某些键的值将值从一个分配到另一个[关闭]答案

【问题标题】：Comparing arrays in php and assign values from one to another by values from certain keys [closed]比较php中的数组并通过某些键的值将值从一个分配到另一个[关闭]
【发布时间】：2013-09-16 22:50:37
【问题描述】：

我已经在我的一个项目上工作了几天，基本上我在这个项目中要做的是比较用户通常在 excel 中执行的 csv 文件，以便在 php 中自动执行每晚。我从 CSV 的介绍数组中获得了信息，但是我无法将它们组合起来以获得每本书的正确信息，因此下面的示例和问题。

我有一个 csv 文件中的以下数组 (array1)，其中 [5] 键将始终为 0：

Array
(
[0] => Array
(
    [0] => book1
    [1] => description1
    [2] => category1
    [3] => code1
    [4] => editor1
    [5] => 0
    [6] => eur
    [7] => out of stoc
)

[1] => Array
(
    [0] => book2
    [1] => description2
    [2] => category2
    [3] => code2
    [4] => editor2
    [5] => 0
    [6] => curr2
    [7] => out of stoc
)

[2] => Array
(
    [0] => book3
    [1] => description3
    [2] => category3
    [3] => code3
    [4] => editor3
    [5] => 0
    [6] => curr3
    [7] => out of stoc
)

[3] => 
)

以及来自第二个 csv 文件的另一个数组 (array2)：

Array
(
[0] => Array
(
    [0] => book1
    [1] => description1
    [2] => category1
    [3] => code1
    [4] => editor1
    [5] => 9
    [6] => eur
    [7] => out of stoc
)

[1] => Array
(
    [0] => book2
    [1] => description2
    [2] => category2
    [3] => code2
    [4] => editor2
    [5] => 0
    [6] => curr2
    [7] => out of stoc
)

[2] => Array
(
    [0] => book3
    [1] => description3
    [2] => category3
    [3] => code3
    [4] => editor3
    [5] => 12
    [6] => curr3
    [7] => in stoc
)

[3] => 
)

还有来自另一个 csv 的 array3：

Array
(
[0] => Array
(
    [0] => book1
    [1] => description1
    [2] => category1
    [3] => code1
    [4] => editor1
    [5] => 10
    [6] => eur
    [7] => in stoc
)

[1] => Array
(
    [0] => book2
    [1] => description2
    [2] => category2
    [3] => code2
    [4] => editor2
    [5] => 0
    [6] => curr2
    [7] => out of stoc
)

[2] => Array
(
    [0] => book3
    [1] => description3
    [2] => category3
    [3] => code3
    [4] => editor3
    [5] => 0
    [6] => curr3
    [7] => out of stoc
)

[3] => 
)

我想知道如何返回一个附加数组 (array4)，其中包含 [5] 键的最小值，但 0 除外，因为对于数组中的每个项目，array1 中的 [5] 键始终为 0 例如：

Array
(
[0] => Array
(
    [0] => book1
    [1] => description1
    [2] => category1
    [3] => code1
    [4] => editor1
    [5] => 10            //  9 < 10, but 9 is not in stock so the next value > 0 is 10
    [6] => eur
    [7] => in stoc
)

[1] => Array
(
    [0] => book2
    [1] => description2
    [2] => category2
    [3] => code2
    [4] => editor2
    [5] => 0           // because this book has 0 price in all arrays, hence the price 
    [6] => curr2       // is not valid
    [7] => out of stoc
)

[2] => Array
(
    [0] => book3
    [1] => description3
    [2] => category3
    [3] => code3
    [4] => editor3
    [5] => 12           // because the only array that contains a valid price is array2
    [6] => curr3
    [7] => out of stoc
)

[3] => 
)

【问题讨论】：

标签： php excel csv multidimensional-array

【解决方案1】：

试试这个：

$merged = $array1;
foreach($merged as $key => &$value) {
    $prices = array($array1[$key][5], $array2[$key][5], $array3[$key][5]);

    //if all prices are 0, the final price is 0
    if(array_sum($prices) == 0) {
        $value[5] = 0;
    }

    //else find the lowest price in $prices that is > 0
    else {
        $minPrice = PHP_INT_MAX;
        foreach($prices as $price) {
            if($price > 0 && $price < $minPrice) {
                $minPrice = $price;
            }
        }
        $value[5] = $minPrice;
    }
}
unset($value);

print_r($merged);

【讨论】：

感谢您提供的解决方案，它就像一个梦想，但不幸的是我发现了我的逻辑中的一个漏洞，因为在我的项目中，array1 将始终具有 [5] key = 0，因此最终过程将始终是0，所以我编辑了问题以符合正确的逻辑。
我做了一些改变；再来一次。
做到了，第三个数组的价格是 0 insted of 12
我需要一些东西来处理所有数组中 [5] 的值，如果该值为 0，那么 [5] 的最终值也将为 0，但如果有任何一个或多个值将是> 0 然后对这些值进行最小值并输出 [5] 的右端值。
哦，我明白了。您不仅要忽略$array1；你想忽略所有的 0，除非所有的价格都是 0。明白了。已编辑。

【解决方案2】：

如果我理解正确，您希望键 #5 的每个数组的最小值，对吗？

如果是这种情况，这将有所帮助：

$min = array();

foreach ($array_x as $key => $value) {
    if ($value[5] > 0) {
        if (!isset($min[$key])) $min[$key] = $value;
        if ($min[$key] < $value[5]) $min[$key] = $value;
    } //end if
} //end foreach

【讨论】：