PHP接收ESP8266数据代码

以下是一个简单的PHP脚本，可以接收ESP8266发送的数据：

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    //接收POST请求
    $data = file_get_contents('php://input');
    
    //处理接收到的数据
    //...
    
    //返回响应
    echo "Data received successfully!";
} else {
    //返回错误信息
    header('HTTP/1.1 405 Method Not Allowed');
    header('Allow: POST');
    echo "Only POST requests are allowed.";
}

在ESP8266上发送POST请求，将数据作为请求体发送到该脚本的URL上即可。例如：

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

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

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  String data = "Hello, PHP!"; //要发送的数据
  String url = "/your_php_script.php"; //PHP脚本的URL
  String request = "POST " + url + " HTTP/1.1\r\n" +
                   "Host: " + host + "\r\n" +
                   "Content-Type: text/plain\r\n" +
                   "Content-Length: " + data.length() + "\r\n" +
                   "Connection: close\r\n\r\n" +
                   data;

  //连接服务器
  WiFiClient client;
  if (!client.connect(host, 80)) {
    Serial.println("Connection failed");
    return;
  }

  //发送请求
  client.print(request);

  //等待响应
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("Response:");
      break;
    }
  }

  //输出响应内容
  while (client.available()) {
    String line = client.readStringUntil('\n');
    Serial.println(line);
  }

  //断开连接
  client.stop();
}

void loop() {
}

以上代码演示了如何使用ESP8266发送POST请求，将字符串"Hello, PHP!"作为请求体发送到PHP脚本的URL上。PHP脚本可以通过`file_get_contents('php://input')`函数来获取请求体中的数据。