PHP框架在公共事业行业的应用

// 获取水表读数
$readings = DB::table('water_readings')->where('meter_id', $meterId)->get();

// 处理读数
foreach ($readings as $reading) {
    // 计算水量
    $volume = $reading->current_reading - $reading->previous_reading;

    // 记录使用情况
    DB::table('water_usage')->insert([
        'meter_id' => $meterId,
        'reading_date' => $reading->reading_date,
        'volume' => $volume
    ]);
}

// 获取客户账单
$bills = $this->db->get_where('bills', ['customer_id' => $customerId]);

// 创建账单 PDF
$pdf = new TCPDF();
$pdf->AddPage();
$pdf->WriteHTML($this->load->view('bills/invoice', ['bills' => $bills], true));
$pdf->Output('invoice.pdf', 'F');

// 发送账单电子邮件
$this->load->library('email');
$this->email->from('billing@example.com', 'Billing Department');
$this->email->to($customerEmail);
$this->email->subject('Invoice for Account No. ' . $customerAccountNumber);
$this->email->attach('invoice.pdf');
$this->email->send();