ESP8266向php发送消息代码

以下是一个ESP8266向PHP服务器发送POST请求的示例代码：

#include <ESP8266WiFi.h>
#include <WiFiClient.h> 

const char* ssid     = "your_SSID";
const char* password = "your_PASSWORD";

const char* host = "your_PHP_server_host";
const int   port = 80;

void setup() {
  Serial.begin(115200);
  delay(10);

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");

  // Send a POST request to the PHP server
  Serial.print("Connecting to ");
  Serial.print(host);
  Serial.print(":");
  Serial.println(port);

  WiFiClient client;
  if (!client.connect(host, port)) {
    Serial.println("connection failed");
    return;
  }

  // Construct the POST request data
  String data = "message=hello world";

  // Send the POST request
  client.println("POST /your_php_file.php HTTP/1.1");
  client.println("Host: your_PHP_server_host");
  client.println("User-Agent: ESP8266/1.0");
  client.println("Connection: close");
  client.println("Content-Type: application/x-www-form-urlencoded");
  client.print("Content-Length: ");
  client.println(data.length());
  client.println();
  client.print(data);

  // Wait for the server to respond
  while (client.connected()) {
    if (client.available()) {
      String line = client.readStringUntil('\r');
      Serial.print(line);
    }
  }

  Serial.println();
  Serial.println("closing connection");
}

void loop() {
}

注意替换代码中的以下变量和值：

- ssid：WiFi网络的名称
- password：WiFi网络的密码
- host：PHP服务器的IP地址或域名
- port：PHP服务器的端口号
- data：POST请求的数据

另外，你需要在PHP服务器上创建一个接收POST请求的PHP文件，并在该文件中处理接收到的数据。