函數內部的foreach不輸出值

Question

我在函數內部使用了foreach，但是無法從中輸出正確的值。

我有一個按功能處理的數組

//this is only a small part of it because it is very large
Array
(
    [2016-05-02] => Array
        (
            [grup_1] => Array
                (
                    [luce] => 4
                    [ctr_ok] => 3
                    [ctr_tot] => 7
                    [ctr_ko] => 4
                    [gas] => 3
                    [ore] => 30.5
                )

            [grup_2] => Array
                (
                    [luce] => 3
                    [ctr_ko] => 4
                    [ctr_tot] => 6
                    [gas] => 3
                    [ctr_ok] => 2
                    [ore] => 47
                )

            [grup_3] => Array
                (
                    [luce] => 6
                    [ctr_ko] => 1
                    [ctr_tot] => 8
                    [ctr_gia_cliente] => 1
                    [ctr_ok] => 6
                    [gas] => 2
                    [ore] => 24
                )

            [grup_4] => Array
                (
                    [luce] => 4
                    [ctr_ok] => 4
                    [ctr_tot] => 8
                    [gas] => 4
                    [ctr_ko] => 4
                    [ore] => 30
                )

            [grup_5] => Array
                (
                    [luce] => 9
                    [ctr_ko] => 11
                    [ctr_tot] => 17
                    [gas] => 8
                    [ctr_ok] => 6
                    [ore] => 35
                )

            [grup_6] => Array
                (
                    [luce] => 1
                    [ctr_ok] => 2
                    [ctr_tot] => 2
                    [gas] => 1
                    [ore] => 36
                )

            [grup_7] => Array
                (
                    [luce] => 5
                    [ctr_ko] => 1
                    [ctr_tot] => 7
                    [ctr_ok] => 6
                    [gas] => 2
                    [ore] => 22
                )

        )

    [2016-05-03] => Array
        (
            [grup_1] => Array
                (
                    [luce] => 6
                    [ctr_ok] => 6
                    [ctr_tot] => 10
                    [gas] => 4
                    [ctr_ko] => 4
                    [ore] => 33.5
                )

            [grup_2] => Array
                (
                    [luce] => 6
                    [ctr_ok] => 4
                    [ctr_tot] => 8
                    [ctr_ko] => 2
                    [gas] => 2
                    [ctr_att_green] => 2
                    [ore] => 36
                )

            [grup_3] => Array
                (
                    [luce] => 6
                    [ctr_ok] => 4
                    [ctr_tot] => 9
                    [gas] => 3
                    [ctr_ko] => 5
                    [ore] => 36
                )

            [grup_4] => Array
                (
                    [luce] => 5
                    [ctr_ko] => 2
                    [ctr_tot] => 10
                    [gas] => 5
                    [ctr_ok] => 8
                    [ore] => 42
                )

            [grup_5] => Array
                (
                    [gas] => 2
                    [ctr_ok] => 3
                    [ctr_tot] => 3
                    [luce] => 1
                    [ore] => 23
                )

            [grup_6] => Array
                (
                    [luce] => 1
                    [ctr_ko] => 2
                    [ctr_tot] => 2
                    [gas] => 1
                    [ore] => 36
                )

            [grup_7] => Array
                (
                    [luce] => 2
                    [ctr_ok] => 1
                    [ctr_tot] => 3
                    [ctr_gia_cliente] => 2
                    [gas] => 1
                    [ore] => 27.3
                )

        )

這是收集ctr_tot鍵總和的ctr_tot

function kontratat_tot($grup_name){
        $total = 0;
        foreach ($kontrata as $date => $grup){
            if($grup[$grup_name]['ctr_tot'] != 0){
                $total += $grup[$grup_name]['ctr_tot'];
            }
        }
    return $total;
}

在這里我調用函數

kontratat_tot("grup_1");

在過去的3個小時中，我一直在尋找解決問題的任何方法，但我一直堅持不懈，即使從我的眼中可以看到解決方案，我也看不到它。

Answer 1

$kontrata 不在 kontratat_tot函數的范圍內 。 嘗試將其指定為global ，或傳遞給函數。

function kontratat_tot($grup_name)
{
    global $kontrata;

    $total = 0;

    foreach( $kontrata as $date => $grup )
    {
        if($grup[$grup_name]['ctr_tot'] != 0)
        {
            $total += $grup[$grup_name]['ctr_tot'];
        }
    }

    return $total;
}

Answer 2

您的函數正在嘗試訪問不在當前范圍內但在父范圍內的$kontrata 。

我建議您將數據作為參數傳遞，定義全局變量並在函數內部訪問它會限制您使用相同的變量名（如果您打算兩次或多次使用此函數）。

function kontratat_tot($kontrata, $grup_name){
        $total = 0;
        foreach ($kontrata as $date => $grup){
            if($grup[$grup_name]['ctr_tot'] != 0){
                $total += $grup[$grup_name]['ctr_tot'];
            }
        }
    return $total;
}