การดึงข้อมูลจาก table ใน mysql มาเก็บในตัวแปรโดยใช้ PHP

void loop() {
  if (client.available()) {
    char c = client.find("output=");
    Serial.write(c);
  }
  if (millis() - lastConnectionTime > postingInterval) {
    httpRequest();
    if(client.find("")){
      client.find("output=");
      value = client.parseFloat();
      Serial.print("Output = ");
      Serial.println(value); 
    }
  }
}
void httpRequest() {
  client.stop();
  if (client.connect(server, 80)) {
    Serial.println("connecting...");
    client.println("GET /~file/readmysql/index.php HTTP/1.1");
    client.println("Host: www.arduino.cc");
    client.println("User-Agent: arduino-ethernet");
    client.println("Connection: close");
    client.println();
    lastConnectionTime = millis();
  } else {
    Serial.println("connection failed");
  }
}