Laravel“ ErrorException（E_NOTICE）未定义的变量：类” [重复]

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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP（28个答案）

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每个人都可以帮助我，我遇到了一个问题“ ErrorException（E_NOTICE）未定义的变量：类”

     $title = "Data Training";
            foreach(Sentimen::all() as $stm){
                $class['class'][] = $stm->kategori;
                $data_training[$stm->kategori] = WordFrequency::where('id_sentimen',$stm->id_sentimen)->get();
            }



            $total = WordFrequency::count();
            foreach($class['class'] as $cls){
                $sum = DB::table('term_frequency')->select(DB::raw('SUM(jumlah) as jumlah_term'))->join('sentimen', 'sentimen.id_sentimen', '=', 'term_frequency.id_sentimen')->where('sentimen.kategori',$cls)->whereNotNull('id_training')->first();   
                $data_sum[] = [
                    'kelas' => $cls,
                    'jumlah' => $sum->jumlah_term,
                ];
            }

Answer 1

$title = "Data Training";
    $class = [];
    $data_training = [];
    foreach(Sentimen::all() as $key => $stm){
        $class['class'] = []; 
        $class['class'][$key] = $stm->kategori;
        $data_training[$stm->kategori] = WordFrequency::where('id_sentimen',$stm->id_sentimen)->get();
    }



    $total = WordFrequency::count();
    foreach($class['class'] as $cls){
        $sum = DB::table('term_frequency')->select(DB::raw('SUM(jumlah) as jumlah_term'))->join('sentimen', 'sentimen.id_sentimen', '=', 'term_frequency.id_sentimen')->where('sentimen.kategori',$cls)->whereNotNull('id_training')->first();   
        $data_sum[] = [
            'kelas' => $cls,
            'jumlah' => $sum->jumlah_term,
        ];
    }