如何更新laravel中的主数组答案

【问题标题】：How to update main array in laravel如何更新laravel中的主数组
【发布时间】：2019-07-18 09:00:51
【问题描述】：

我需要帮助更新 Main Array 并在 foreach 循环中更改其数据。这是我的代码：

$query = DB::table('autostk')
    ->where('autostk.branchid', $branch_id)
    ->where('autostk.itemcode', $request->itemcode)
    ->whereDate('autostk.date', '<=', $request->tdate)
    ->where('autostk.branchid', $branch_id)
    ->leftjoin('journal', 'autostk.refno', '=', 'journal.vno')
    ->where('journal.code', '>=', 100)
    ->where('journal.branchid', $branch_id)
    ->leftjoin('accounts', 'journal.code', '=', 'accounts.code')
    ->where('accounts.branchid', $branch_id)
    ->select('journal.code', 'accounts.title', 'autostk.*')
    ->orderBY('date')->get()
    ->map(function ($item, $key) {
        return (array)$item;
    })
    ->all();

foreach ($query as $row) {
    if (is_null($row['qtyin'])) {
        $row['qtyin'] = 0;
    }
    if (is_null($row['qtyout'])) {
        $row['qtyout'] = 0;
    }
    if (is_null($row['rate'])) {
        $row['rate'] = 0;
    }
    if ($row['vtype'] = 'PI' && $row['qtyin'] > 0) {
        $stkval = ($bal * $avgrate) + ($row['qtyin'] * $row['rate']);
        if ($bal > 0) {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            if ($bal > 0 && $stkval > 0) {
                $avgrate = $stkval / $bal;
            }
        } else {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            $avgrate = $row['rate'];
        }
    } else {
        $bal = $bal + $row['qtyin'] - $row['qtyout'];
    }
    $row['balqty'] = $bal;
    $row['avgrate'] = $avgrate;
}

我的问题是如何使用对 $row 所做的更改来更新 $query。我是 php 和 laravel 的新手，尝试过 push()、put() 等。不知道在这种情况下需要哪个函数。

【问题讨论】：

如果要向数组添加新值，则可以使用 push。你能详细解释一下你的问题吗？

标签： arrays laravel laravel-5.8

【解决方案1】：

要将您应用到 $row 的更改保留在 foreach 中，您只需通过引用传递它：

foreach ($query as &$row) { //notice the & before $row

或者，您可以将foreach 中的代码移动到map 闭包中：

->map(function ($item, $key) use ($bal, $avgrate) {

    $row = (array)$item;

    if (is_null($row['qtyin'])) {
        $row['qtyin'] = 0;
    }
    if (is_null($row['qtyout'])) {
        $row['qtyout'] = 0;
    }
    if (is_null($row['rate'])) {
        $row['rate'] = 0;
    }
    if ($row['vtype'] = 'PI' && $row['qtyin'] > 0) {
        $stkval = ($bal * $avgrate) + ($row['qtyin'] * $row['rate']);
        if ($bal > 0) {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            if ($bal > 0 && $stkval > 0) {
                $avgrate = $stkval / $bal;
            }
        } else {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            $avgrate = $row['rate'];
        }
    } else {
        $bal = $bal + $row['qtyin'] - $row['qtyout'];
    }
    $row['balqty'] = $bal;
    $row['avgrate'] = $avgrate;

    return $row;

})

【讨论】：

非常感谢。 foreach ($query as &$row) 效果很好。

【解决方案2】：

试试下面的代码：

$query = DB::table('autostk')
    ->where('autostk.branchid', $branch_id)
    ->where('autostk.itemcode', $request->itemcode)
    ->whereDate('autostk.date', '<=', $request->tdate)
    ->where('autostk.branchid', $branch_id)
    ->leftjoin('journal', 'autostk.refno', '=', 'journal.vno')
    ->where('journal.code', '>=', 100)
    ->where('journal.branchid', $branch_id)
    ->leftjoin('accounts', 'journal.code', '=', 'accounts.code')
    ->where('accounts.branchid', $branch_id)
    ->select('journal.code', 'accounts.title', 'autostk.*')
    ->orderBY('date')->get()
    ->map(function ($item, $key) {
        return (array)$item;
    })
    ->all();

$row_data = [];
foreach ($query as $row) {
    if (is_null($row['qtyin'])) {
        $row['qtyin'] = 0;
    }
    if (is_null($row['qtyout'])) {
        $row['qtyout'] = 0;
    }
    if (is_null($row['rate'])) {
        $row['rate'] = 0;
    }
    if ($row['vtype'] = 'PI' && $row['qtyin'] > 0) {
        $stkval = ($bal * $avgrate) + ($row['qtyin'] * $row['rate']);
        if ($bal > 0) {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            if ($bal > 0 && $stkval > 0) {
                $avgrate = $stkval / $bal;
            }
        } else {
            $bal = $bal + $row['qtyin'] - $row['qtyout'];
            $avgrate = $row['rate'];
        }
    } else {
        $bal = $bal + $row['qtyin'] - $row['qtyout'];
    }
    $row['balqty'] = $bal;
    $row['avgrate'] = $avgrate;
    $row_data[] = $row;
}

现在使用$row_data。

【讨论】：

【解决方案3】：

选项 1

//use toArray() in last to get the result as an array
$query = ...->all()->toArray();

foreach ($query as $key => $row) {
     //inside here instead of using $row, use $query[$key]
     //so for example $row['rate'] = 0; becomes:
     $query[$key]['rate'] = 0;
}

选项 2

//use toArray() in last to get the result as an array
$query = ...->all()->toArray();

//use pass by reference with help of &
foreach ($query as $key => &$row) {
   ...
}

但是，使用引用传递方法时要非常小心，否则如果重复使用相同的数组，可能会遇到问题。

选项 3

$query = ...->all();
foreach ($query as $key => $row) {
    //access it as object
    //instead of using $row['qtyin'] use:
    $row->qtyin = 0;
}

经销商的选择:)

【讨论】：