数组中值的智能减法（php）

Question

PHP 语言

是否很难编写一个函数来从数组中的每个 [Amount] 值中减去值？直到减法值被平息为止？。

我需要的示例（减法前）：

[MainStockAddedArr] => Array
                        (
                            [0] => Array
                                (
                                    [Amount] => 10
                                    [Price] => 19.44
                                )

                            [1] => Array
                                (
                                    [Amount] => 15
                                    [Price] => 15.55
                                )

                            [2] => Array
                                (
                                    [Amount] => 20
                                    [Price] => 11.55
                                )

                            [3] => Array
                                (
                                    [Amount] => 30
                                    [Price] => 11.10
                                )

                        )

要减去的值例如是 30 件。所以我需要在数组中得到这样的结果：

    [MainStockAddedArr] => Array
                        (
                            [0] => Array
                                (
                                    [Amount] => 0
                                    [Price] => 19.44
                                )

                            [1] => Array
                                (
                                    [Amount] => 0
                                    [Price] => 15.55
                                )

                            [2] => Array
                                (
                                    [Amount] => 15
                                    [Price] => 11.55
                                )

                            [3] => Array
                                (
                                    [Amount] => 30
                                    [Price] => 11.10
                                )

                        )

在上面的例子中，两个值被更改为 0，这样就给出了 25 件已经被拿走，第三个值只有 5 已经被拿走了，这给出了 30 件所以不需要更多。这只是示例，减法值将是动态的，来自高于此循环的循环。

在减法值大于整个数组（总和 [Amounts]）的情况下，需要其他。

Answer 1

这里是FIFO（先进先出）方法的示例..你可以试试，如果需要的话可以做一些修正。

作为常规函数：

function fifo($argArray, $argValue, $colName = 'amount') {

    // initialize
    $total = is_numeric($argValue) ? $argValue : 0;
    $i = 0;

    // check for input amount (total)
    if ($total > 0) {

        // process the input array 
        foreach ($arrArray as $key => $v) {

            // initialize amount value
            $amount = $remains = $v[$colName] ?: 0;

            // check for amount availability
            if ($amount) {
                // increment counter
                $i++;

                // calculate amount value remains
                $remains -= $amount > $total ? $total : $amount;

                // set amount value remains in array
                $argArray[$key][$colName] = $remains;

                // calculate last total remains
                $total -= $amount - $remains;

                // when total remains is zero then exit the loop process
                if ($total === 0) break;
            }
        }
    }

    // return count of rows been used and total remains
    return ['rowsCount' => $i, 'totalRemains' => $total];
}

用法：

$result = fifo(<argArray>, <argValue>, [<columnName>]);

作为 class:

namespace AnyNamespace;

class AnyClass extend \ArrayObject {

public function getFifo($argValue, $colName = 'amount') {
    return $this::fifo($this, $argValue, $colName);
}

public static function fifo($argArray, $argValue, $colName = 'amount') {

    // initialize
    $total = is_numeric($argValue) ? $argValue : 0;
    $i = 0;

    // check for input amount (total)
    if ($total > 0) {

        // process the input array 
        foreach ($arrArray as $key => $v) {

            // initialize amount value
            $amount = $remains = $v[$colName] ?: 0;

            // check for amount availability
            if ($amount) {
                // increment counter
                $i++;

                // calculate amount value remains
                $remains -= $amount > $total ? $total : $amount;

                // set amount value remains in array
                $argArray[$key][$colName] = $remains;

                // calculate last total remains
                $total -= $amount - $remains;

                // when total remains is zero then exit the loop process
                if ($total === 0) break;
            }
        }
    }

    // return count of rows been used and total remains
    return ['rowsCount' => $i, 'totalRemains' => $total];
}
}

用法：

use AnyNamespace;
...
$result = AnyClass::fifo(<argArray>, <argValue>, [<columnName>]);

或

use AnyNamespace;
...
$anyClass = new AnyClass(<inputArray>);

$result = $anyClass->getFifo(<argValue>, [<columnName>]);

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