public function run() { DB::table('tennis')->delete(); for ($offset = 0; $offset < 7; $offset++) { for ($i = 1; $i <= 4; $i++) { Tennis::create(['name' => '网球' . $i . '号场', 'date' => date('Y-m-d', strtotime('+' . $offset . ' day')), 'six2seven' => 0, 'seven2eight' => 0, 'eight2nine' => 0]); } } }