Laravel "Undefined offset: 4" 使用 faker 时出现异常,如何去除偏移量?

Laravel "Undefined offset: 4" exception when working with faker , how to remove the offset?

    public function run(){
    $types = ['Travelling','Camping','Restaurants','Food'];

    for ($i = 0; $i < 50; $i++){

        $faker = Factory::create();
        $internet = new Internet($faker);
        $date = new DateTime($faker);
        $lorem = new Lorem($faker);

        $id = $internet->numberBetween($min = 2000,$max = 2000000);
        $price = $internet->randomFloat($nbMaxDecimals = 2, $min = 0, $max = 100);
        $expiration = $date->dateTimeBetween($startDate = 'now', $endDate = '+2 years');
        $title = $lorem->sentence($nbWords = 3, $variableNbWords = true);

        DB::table('coupon')->insert([
            'id'=>$id,
            'title'=>$title,
            'price'=>$price,
            "type"=>$types[$i],
            'expiration'=>$expiration
        ]);
    }
}

table更新了4行。 需要你的帮助,请不明白如何克服偏移量限制? 任何额外的配置?

Illuminate\Foundation\Bootstrap\HandleExceptions::handleError("Undefined offset: 4","C:\xampp\htdocs\couponsystem\database\seeds\CouponSeeder.php")

肯定是因为您的变量类型仅由 4 个元素组成,当您的 foor 循环中的变量 i 为 4 时,它会抛出错误 undifined offset 4。解决此问题。

改变这个,"type" => $types[$i]

至,"type" => $types[rand(0, 3)]

$types数组只有4个元素,没有索引4

使用modulo 4确保数字永远不会超过 3 并保持从 0 到 3 的循环。

"type" => $types[$i % 4],