在laravel-excel中循环遍历数组中的数组

Posted 2023-03-14

【中文标题】在laravel-excel中循环遍历数组中的数组

【英文标题】：Looping through an array within an array in laravel-excel

【发布时间】：2015-11-18 05:14:52

【问题描述】：

我正在使用 laravel-excel 尝试上传 .csv 文件，然后遍历上传的文件以更新数据库。我认为正在发生的是 laravel-excel 正在数组中创建一个数组，我不知道如何从第二级数组中检查和检索。无论如何我可以通过我这样做的方式获取此代码来更新数据库吗？提前致谢。

我的控制器：

public function store()


    $csv = Input::file('csv');
    $destinationPath = public_path().'/lists';
    // If the uploads fail due to file system, you can try doing public_path().'/uploads' 
    $filename = $csv->getClientOriginalName();
    // $extension = $csv->getClientOriginalExtension(); 
    $upload_success = Input::file('csv')->move($destinationPath, $filename);


    Excel::load(public_path().'/lists/states.csv', function($reader) 

        // reader methods
        $dbseeder = $reader->select(array('state', 'total'))->get()->toArray();

        foreach ($dbseeder as $state => $total)
            DB::table('distributors')
                ->where('state', $state)
                ->update(array('total' => $total));
        

        print_r($dbseeder);

);

Print_R($dbseeder) 产生以下结果。如果我执行 print_r($reader) 则会产生一堆其他值（都与 Maatwebsite 的工具有关）：

Array ( [0] => Array ( [state] => AK [total] => 0 ) [1] => Array ( [state] => AL [total] => 5 ) [2] => Array ( [state] => AR [total] => 10 ) [3] => Array ( [state] => AZ [total] => 5 ) [4] => Array ( [state] => CA [total] => 10 ) [5] => Array ( [state] => CO [total] => 11 ) [6] => Array ( [state] => CT [total] => 15 ) [7] => Array ( [state] => DC [total] => 16 ) [8] => Array ( [state] => DE [total] => 20 ) [9] => Array ( [state] => FL [total] => 21 ) [10] => Array ( [state] => GA [total] => 1 ) [11] => Array ( [state] => HI [total] => 0 ) [12] => Array ( [state] => IA [total] => 4 ) [13] => Array ( [state] => ID [total] => 5 ) [14] => Array ( [state] => IL [total] => 2 ) [15] => Array ( [state] => IN [total] => 6 ) [16] => Array ( [state] => KS [total] => 9 ) [17] => Array ( [state] => KY [total] => 10 ) [18] => Array ( [state] => LA [total] => 11 ) [19] => Array ( [state] => MA [total] => 17 ) [20] => Array ( [state] => MD [total] => 22 ) [21] => Array ( [state] => ME [total] => 33 ) [22] => Array ( [state] => MI [total] => 11 ) [23] => Array ( [state] => MN [total] => 2 ) [24] => Array ( [state] => MO [total] => 3 ) [25] => Array ( [state] => MS [total] => 7 ) [26] => Array ( [state] => MT [total] => 44 ) [27] => Array ( [state] => NC [total] => 14 ) [28] => Array ( [state] => ND [total] => 13 ) [29] => Array ( [state] => NE [total] => 7 ) [30] => Array ( [state] => NH [total] => 17 ) [31] => Array ( [state] => NJ [total] => 18 ) [32] => Array ( [state] => NM [total] => 19 ) [33] => Array ( [state] => NV [total] => 21 ) [34] => Array ( [state] => NY [total] => 0 ) [35] => Array ( [state] => OH [total] => 44 ) [36] => Array ( [state] => OK [total] => 55 ) [37] => Array ( [state] => OR [total] => 7 ) [38] => Array ( [state] => PA [total] => 12 ) [39] => Array ( [state] => RI [total] => 3 ) [40] => Array ( [state] => SC [total] => 2 ) [41] => Array ( [state] => SD [total] => 8 ) [42] => Array ( [state] => TN [total] => 15 ) [43] => Array ( [state] => TX [total] => 16 ) [44] => Array ( [state] => UT [total] => 20 ) [45] => Array ( [state] => VA [total] => 21 ) [46] => Array ( [state] => VT [total] => 26 ) [47] => Array ( [state] => WA [total] => 33 ) [48] => Array ( [state] => WI [total] => 13 ) [49] => Array ( [state] => WV [total] => 12 ) [50] => Array ( [state] => WY [total] => 8 ) )

当我在 dbseeder 上执行 var_dump 时，我得到：

array(51)  [0]=> array(2)  ["state"]=> string(2) "AK" ["total"]=> float(0)  [1]=> array(2)  ["state"]=> string(2) "AL" ["total"]=> float(5)  [2]=> array(2)  ["state"]=> string(2) "AR" ["total"]=> float(10)  [3]=> array(2)  ["state"]=> string(2) "AZ" ["total"]=> float(5)  [4]=> array(2)  ["state"]=> string(2) "CA" ["total"]=> float(10)  [5]=> array(2)  ["state"]=> string(3) "CO " ["total"]=> float(11)  [6]=> array(2)  ["state"]=> string(2) "CT" ["total"]=> float(15)  [7]=> array(2)  ["state"]=> string(3) "DC " ["total"]=> float(16)  [8]=> array(2)  ["state"]=> string(4) "DE " ["total"]=> float(20)  [9]=> array(2)  ["state"]=> string(3) "FL " ["total"]=> float(21)  [10]=> array(2)  ["state"]=> string(3) "GA " ["total"]=> float(1)  [11]=> array(2)  ["state"]=> string(3) "HI " ["total"]=> float(0)  [12]=> array(2)  ["state"]=> string(3) "IA " ["total"]=> float(4)  [13]=> array(2)  ["state"]=> string(2) "ID" ["total"]=> float(5)  [14]=> array(2)  ["state"]=> string(3) "IL " ["total"]=> float(2)  [15]=> array(2)  ["state"]=> string(4) "IN " ["total"]=> float(6)  [16]=> array(2)  ["state"]=> string(3) "KS " ["total"]=> float(9)  [17]=> array(2)  ["state"]=> string(3) "KY " ["total"]=> float(10)  [18]=> array(2)  ["state"]=> string(3) "LA " ["total"]=> float(11)  [19]=> array(2)  ["state"]=> string(4) "MA " ["total"]=> float(17)  [20]=> array(2)  ["state"]=> string(3) "MD " ["total"]=> float(22)  [21]=> array(2)  ["state"]=> string(3) "ME " ["total"]=> float(33)  [22]=> array(2)  ["state"]=> string(3) "MI " ["total"]=> float(11)  [23]=> array(2)  ["state"]=> string(3) "MN " ["total"]=> float(2)  [24]=> array(2)  ["state"]=> string(3) "MO " ["total"]=> float(3)  [25]=> array(2)  ["state"]=> string(3) "MS " ["total"]=> float(7)  [26]=> array(2)  ["state"]=> string(3) "MT " ["total"]=> float(44)  [27]=> array(2)  ["state"]=> string(3) "NC " ["total"]=> float(14)  [28]=> array(2)  ["state"]=> string(3) "ND " ["total"]=> float(13)  [29]=> array(2)  ["state"]=> string(3) "NE " ["total"]=> float(7)  [30]=> array(2)  ["state"]=> string(3) "NH " ["total"]=> float(17)  [31]=> array(2)  ["state"]=> string(3) "NJ " ["total"]=> float(18)  [32]=> array(2)  ["state"]=> string(3) "NM " ["total"]=> float(19)  [33]=> array(2)  ["state"]=> string(3) "NV " ["total"]=> float(21)  [34]=> array(2)  ["state"]=> string(3) "NY " ["total"]=> float(0)  [35]=> array(2)  ["state"]=> string(3) "OH " ["total"]=> float(44)  [36]=> array(2)  ["state"]=> string(3) "OK " ["total"]=> float(55)  [37]=> array(2)  ["state"]=> string(3) "OR " ["total"]=> float(7)  [38]=> array(2)  ["state"]=> string(3) "PA " ["total"]=> float(12)  [39]=> array(2)  ["state"]=> string(3) "RI " ["total"]=> float(3)  [40]=> array(2)  ["state"]=> string(3) "SC " ["total"]=> float(2)  [41]=> array(2)  ["state"]=> string(3) "SD " ["total"]=> float(8)  [42]=> array(2)  ["state"]=> string(3) "TN " ["total"]=> float(15)  [43]=> array(2)  ["state"]=> string(3) "TX " ["total"]=> float(16)  [44]=> array(2)  ["state"]=> string(3) "UT " ["total"]=> float(20)  [45]=> array(2)  ["state"]=> string(3) "VA " ["total"]=> float(21)  [46]=> array(2)  ["state"]=> string(3) "VT " ["total"]=> float(26)  [47]=> array(2)  ["state"]=> string(3) "WA " ["total"]=> float(33)  [48]=> array(2)  ["state"]=> string(3) "WI " ["total"]=> float(13)  [49]=> array(2)  ["state"]=> string(3) "WV " ["total"]=> float(12)  [50]=> array(2)  ["state"]=> string(3) "WY " ["total"]=> float(8)  

【参考方案1】：

您可以按如下方式逐步遍历多维数组：

foreach ( $dbseeder as $k1 => $v1 ) 
    if ( is_array($v1) ) 
        foreach ( $v1 as $k2 => $v2 ) 
            /**
             *  This gives you access to $v2['state'] and $v2['total']
             */
            DB::table('distributors')
                ->where('state', $v2['state'])
                ->update(array('total' => $v2['total']));
            
    

【讨论】：

在使用上述代码时，我得到了非法的字符串偏移“状态”。 'state' 是指 $v2['state']，而不是先前的 'state'。我想也许我必须更深一层？我会尝试按照你的模式。

我升级了一个级别，我没有错误，但不幸的是，数据库似乎没有更新。

如果我这样做： foreach ( $dbseeder as $k1 => $v1 ) if ( is_array($v1) ) foreach ( $v1 as $k2 => $v2 ) echo $k2 ;回声 $v2; if (is_array($v2) ) foreach ($v2 as $k3 => $v3 ) DB::table('distributors') ->where('state', $v3['state']) ->update (array('total' => $v3['total'])); 那么 print_r 上的输出是： stateAKtotal0stateALtotal5stateARtotal10stateAZtotal5 等等...我会看@removing

【参考方案2】：

感谢 Dave 和我自己，以下代码有效：

$csv = Input::file('csv');
$destinationPath = public_path().'/lists';
    // If the uploads fail due to file system, you can try doing public_path().'/uploads' 
    $filename = $csv->getClientOriginalName();
    // $extension = $csv->getClientOriginalExtension(); 
    $upload_success = Input::file('csv')->move($destinationPath, $filename);


    Excel::load(public_path().'/lists/states.csv', function($reader) 

        // reader methods
        $dbseeder = $reader->select(array('state', 'total'))->get()->toArray();
        foreach ( $dbseeder as $k1 => $v1 ) 
            if ( is_array($v1) ) 
                foreach ( $v1 as $k2 => $v2 ) 
                    // print_r($k2);
                    // print_r($v2);
                    DB::table('distributors')
                        ->where('state', $v1['state'])
                        ->update(array('total' => $v1['total']));
                    
                
            

    $allstates = DB::table('distributors')->lists('state');
    $alltotals = DB::table('distributors')->lists('total');

    return View::make('create')
    ->with(compact('allstates'))
    ->with(compact('alltotals'));