Code igniter

 public function router_post() {
        #new version
        $dt = file_get_contents('php://input');
        $data_input = json_decode($dt);
        file_put_contents('./log/trx-contents-' . date('Y-m-d') . '.txt', date('Y-m-d H:i:s') . '||' . $dt . "\n", FILE_APPEND);
        file_put_contents('./log/trx-' . date('Y-m-d') . '.txt', date('Y-m-d H:i:s') . '||' . json_encode($data_input) . '||' . json_encode(apache_request_headers()) . "\n", FILE_APPEND);
        $data = array();
        $data['reffid'] = isset($data_input->reffid) ? $data_input->reffid : "";
        $data['userid'] = isset($data_input->userid) ? $data_input->userid : "";
        $data['target'] = isset($data_input->target) ? fixNo($data_input->target) : "";
        $data['amount'] = isset($data_input->amount) ? $data_input->amount : "";
        $data['terminal'] = isset($data_input->terminal) ? $data_input->terminal : "";
        $data['timestamp'] = isset($data_input->timestamp) ? $data_input->timestamp : "";
        $data['sign'] = isset($data_input->sign) ? $data_input->sign : "";
        $data['prodName'] = isset($data_input->prodName) ? $data_input->prodName : "";
        $data['ip_req'] = isset($data_input->ip_req) ? $data_input->ip_req : $this->input->ip_address();
        $data['input_format'] = isset($data_input->input_format) ? $data_input->input_format : 'nextgen';
        $data['system_req'] = $dt;
        file_put_contents('./log/trx-data-' . date('Y-m-d') . '.txt', date('Y-m-d H:i:s') . '||' . json_encode($data_input) . '||' . json_encode(apache_request_headers()) . '||' . json_encode($data) . "\n", FILE_APPEND);
        $this->load->model('model_filter');
        $data_filter = $this->model_filter->filterBuy($data);
        file_put_contents('./log/response-' . date('Y-m-d') . '.txt', date('Y-m-d H:i:s') . '||' . json_encode($data_filter) . "\n", FILE_APPEND);
        $this->response($data_filter, 200);
    }
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------Penjelasan Orang lain --------------------------
Penjelasan :
        nangkep pengiriman data yg masuk lalu di log?
    kebanyakan cuma baca input.. trus di log (ada 3 file log), kemudian dikirim buat di proses $data_filter = $this->model_filter->filterBuy($data); lalu dikirim $this->response($data_filter, 200);