如果另一个对象数组元素ID具有相同的ID，如何将新元素添加（更新）到对象数组中？答案

【问题标题】：How to add (update with) new element into array of objects if another array of objects element id have same id?如果另一个对象数组元素ID具有相同的ID，如何将新元素添加（更新）到对象数组中？
【发布时间】：2014-04-26 02:42:42
【问题描述】：

我在 PHP 中有这些数组：

Array1
(
[0] => stdClass Object
    (
        [expense_id] => 475
        [expense_name] => DRAY 
        [expense_unit_cost] => 270.00
    )

[1] => stdClass Object
    (
        [expense_id] => 476
        [expense_name] => FUEL 
        [expense_unit_cost] => 32.40
    )

)

和

Array2
(
[0] => stdClass Object
    (
        [waybill_id] => 20005044
        [expense_id] => 475
        [tax_select] => tax1
        [tax_id] => 1
        [tax_name] => GST 5%
        [tax_no] => 
        [tax_value] => 13.5000
    )

[1] => stdClass Object
    (
        [waybill_id] => 20005044
        [expense_id] => 475
        [tax_select] => tax2
        [tax_id] => 2
        [tax_name] => QST 9.975%
        [tax_no] => 
        [tax_value] => 26.9325
    )

[2] => stdClass Object
    (
        [waybill_id] => 20005044
        [expense_id] => 476
        [tax_select] => tax1
        [tax_id] => 1
        [tax_name] => GST 5%
        [tax_no] => 
        [tax_value] => 1.6200
    )

[3] => stdClass Object
    (
        [waybill_id] => 20005044
        [expense_id] => 476
        [tax_select] => tax2
        [tax_id] => 2
        [tax_name] => QST 9.975%
        [tax_no] => 
        [tax_value] => 3.2319
    )

)

我需要使用费用 ID 组合 2 个数组，结果必须如下所示：

Array3
(
[0] => stdClass Object
    (
        [expense_id] => 475
        [expense_name] => DRAY 
        [expense_unit_cost] => 270.00
        [expense_taxes] => Array
            (
                [0] => stdClass Object
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 475
                        [tax_select] => tax1
                        [tax_id] => 1
                        [tax_name] => GST 5%
                        [tax_no] => 
                        [tax_value] => 13.5000
                    )

                [1] => stdClass Object
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 475
                        [tax_select] => tax2
                        [tax_id] => 2
                        [tax_name] => QST 9.975%
                        [tax_no] => 
                        [tax_value] => 26.9325
                    )
            )       

    )

[1] => stdClass Object
    (
        [expense_id] => 476
        [expense_name] => FUEL 
        [expense_unit_cost] => 32.40
        [expense_taxes] => Array
            (
                [0] => stdClass Object
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 476
                        [tax_select] => tax1
                        [tax_id] => 1
                        [tax_name] => GST 5%
                        [tax_no] => 
                        [tax_value] => 1.6200
                    )

                [1] => stdClass Object
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 476
                        [tax_select] => tax2
                        [tax_id] => 2
                        [tax_name] => QST 9.975%
                        [tax_no] => 
                        [tax_value] => 3.2319
                    )
            )           

    )

)

如您所见，我在两个数组上都有 expense_id，它需要成为最终 Array3 的关键

我尝试循环一个数组并检查费用 ID 键匹配，但我无法实现我的最终数组。此外，我还查看了 array_merge、array_map 和 array_intersect。

感谢您的建议。

【问题讨论】：

我认为循环可以解决这个问题，你能把你的代码贴在这里吗，也许有一个错误。
代码要复杂得多，贴在这里。谢谢。

标签： php arrays array-merge

【解决方案1】：

尝试类似...

foreach($object AS $key=>$element){ if ($element->expense_id == 475){ $element->expense_taxes[0] = $stdClass; } }

【讨论】：

谢谢。我之前尝试过但由于对象数组而没有成功。

【解决方案2】：

这有点复杂，因为实际的对象数组是从 ajax 获取到 PHP 中的，但是，我根据 KennyDope 的建议找到了答案。

如果 Array1 是 $expenses_obj 而 Array2 是 $invoice_taxes_obj

        foreach ($expenses_obj as $key => $expense):
            foreach ($invoice_taxes_obj as $key => $tax):
                if ($expense->expense_id == $invoice_taxes_obj[$key]->expense_id){
                    $expense->taxes[] = (array)$invoice_taxes_obj[$key]; 
                }   
            endforeach;
        endforeach;

而最终的结果就是我所需要的：

Array
(
[0] => stdClass Object
    (
        [expense_id] => 475
        [expense_name] => DRAY 
        [expense_unit_cost] => 270.00
        [taxes] => Array
            (
                [0] => Array
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 475
                        [tax_select] => tax1
                        [tax_id] => 1
                        [tax_name] => GST 5%
                        [tax_no] => 
                        [tax_value] => 13.5000
                    )

                [1] => Array
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 475
                        [tax_select] => tax2
                        [tax_id] => 2
                        [tax_name] => QST 9.975%
                        [tax_no] => 
                        [tax_value] => 26.9325
                    )

            )

    )

[1] => stdClass Object
    (
        [expense_id] => 476
        [expense_name] => FUEL 
        [expense_unit_cost] => 32.40
        [taxes] => Array
            (
                [0] => Array
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 476
                        [tax_select] => tax1
                        [tax_id] => 1
                        [tax_name] => GST 5%
                        [tax_no] => 
                        [tax_value] => 1.6200
                    )

                [1] => Array
                    (
                        [waybill_id] => 20005044
                        [expense_id] => 476
                        [tax_select] => tax2
                        [tax_id] => 2
                        [tax_name] => QST 9.975%
                        [tax_no] => 
                        [tax_value] => 3.2319
                    )

            )

    )

)

欢迎您的 cmets。感谢您的意见。

【讨论】：