Laravel CSV导出错误

Question

I want to generate csv and below is my code. but im getting error

array_keys() expects parameter 1 to be array, object given

csv controller function

        $list = DB::table('festivals')
        ->join('namedesgs', 'festivals.id', '=', 'namedesgs.festival')
        ->select(DB::raw("festivals.id ,GROUP_CONCAT(namedesgs.name SEPARATOR '\n') as names,GROUP_CONCAT(namedesgs.designation SEPARATOR '\n') as namese"))
        ->groupBy('festivals.id')
        ->get();

    array_unshift($list, array_keys($list[0]));

$callback = function () use ($list) {
$FH = fopen('php://output', 'w');
foreach ($list as $row) {
    foreach ($row as $key => $val) {
        $row[$key] = '="'.str_replace('"', '\"', $val).'"';
    }
    fputcsv($FH, $row);
}
fclose($FH);

};

    return 

Response::stream($callback, 200, $headers);

Answer 1

You can use toArray() function after get() to convert result collection into the array like following:

$list = DB::table('festivals')
        ->join('namedesgs', 'festivals.id', '=', 'namedesgs.festival')
        ->select(DB::raw("festivals.id ,GROUP_CONCAT(namedesgs.name SEPARATOR '\n') as names,GROUP_CONCAT(namedesgs.designation SEPARATOR '\n') as namese"))
        ->groupBy('festivals.id')
        ->get()
        ->toArray();

Then your below code will work okay!