PHP 更新本地公网IP到阿里云域名解析，实现 DDNS

<?php
#需要配置的项
define('ACCESSKEYID','AAAAAAAAAAAAAAAA');                  #阿里云用户密钥ID 获取方法 https://help.aliyun.com/knowledge_detail/38738.html
define('ACCESSKEYSECRET','AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA');#阿里云用户密钥
define('RR','myhome');                                     #二级域名的记录名 如果是一级 请用@
define('DOMAIN','myhome.baidu.com');                       #完整域名  
define('RECORDID','11111111111111111');                    #解析记录ID
/*关键如何获取解析记录ID ，需要在下面这个地址中
https://api.aliyun.com/?spm=a2c4g.11186623.2.26.79ae2846d9RBBa#/?product=Alidns&api=AddDomainRecord&params={}&tab=DEMO&lang=JAVA
先设置一个记录（二级域名） 然后返回结果中获取这个ID 添加记录所需的参数文档在下面这里查看
https://help.aliyun.com/document_detail/29772.html?spm=a2c4g.11186623.4.3.392b5eb4SAeph9

*/
# 获取自己公网 IP 的接口
define('GET_IP_URL','myip.fireflysoft.net');
define('IP_FILE',__DIR__. DIRECTORY_SEPARATOR .'ip.txt');

function 获取HTTP($url)
{
    $curl_samples = curl_init();
    $options = [CURLOPT_URL => $url,CURLOPT_RETURNTRANSFER => 1,CURLOPT_FOLLOWLOCATION => 1,CURLOPT_SSL_VERIFYPEER => 0];
    curl_setopt_array($curl_samples, $options);                
    curl_setopt($curl_samples, CURLOPT_CUSTOMREQUEST, 'GET');  
    $result = curl_exec($curl_samples);                            
    $info = curl_getinfo($curl_samples); 
    $curl_err = curl_errno($curl_samples);
    curl_close($curl_samples);                                 
    if( 0 != $curl_err )
    {
        echo "getip error:".date('Y-m-d H:i:s',time());
        var_dump($info);
        echo PHP_EOL;
        var_dump($result);
        echo PHP_EOL;
        echo $curl_err;
        echo PHP_EOL;
        exit;
    }
    return $result;
}
 
function 编码字符($string)
{
    $result = urlencode($string);
    $result = str_replace(['+', '*'], ['%20', '%2A'], $result);
    $result = preg_replace('/%7E/', '~', $result);
    return $result;
}

function 排序参数计算签名($parameters,$method="GET")
{
    ksort($parameters);
    $canonicalizedQuery = '';
    foreach ($parameters as $key => $value) 
    {
        $canonicalizedQuery .= '&' . 编码字符($key) . '=' . 编码字符($value);
    }
    
    $stringToBeSigned = $method. '&%2F&'. 编码字符(substr($canonicalizedQuery, 1));
    return base64_encode(hash_hmac('sha1', $stringToBeSigned, ACCESSKEYSECRET . '&', true));
}

function 获取当前的解析记录值()
{
    #请求dns的API重新做解析
    $api_url = 'https://alidns.aliyuncs.com/?';
    $data = [];
    #公共参数
    $data['Format']          = 'json';
    $data['Version']         = '2015-01-09';
    $data['SignatureMethod'] = 'HMAC-SHA1';
    $data['SignatureNonce']  = uniqid();
    $data['SignatureVersion']= '1.0';
    $data['AccessKeyId']     = ACCESSKEYID; 
    $data['Timestamp']       = gmdate("Y-m-d\TH:i:s\Z");
    #专用参数
    $data['Action']     = 'DescribeDomainRecordInfo';
    $data['RecordId']   = RECORDID; #解析记录的ID，此参数在添加解析时会返回，在获取域名解析列表时会返回
    #签名
    $data['Signature']  = 排序参数计算签名($data);
    #请求接口
    $json = 获取HTTP($api_url . http_build_query($data));
    $result = json_decode($json,true);
    return $result['Value'];
    
}

function 主函数()
{   
    #获取现在网络的IP
    $ip = 获取HTTP(GET_IP_URL);
    #获取现在域名的解析结果 也就是旧的IP
    $旧IP = 获取当前的解析记录值();
    #对比新旧IP是否一样
    if(!isset($旧IP) || $旧IP !== $ip)
    {
        #请求dns的API重新做解析
        $api_url = 'https://alidns.aliyuncs.com/?';
        $data = [];
        #公共参数
        $data['Format']          = 'json';
        $data['Version']         = '2015-01-09';
        $data['SignatureMethod'] = 'HMAC-SHA1';
        $data['SignatureNonce']  = uniqid();
        $data['SignatureVersion']= '1.0';
        $data['AccessKeyId']     = ACCESSKEYID; 
        $data['Timestamp']       = gmdate("Y-m-d\TH:i:s\Z");
        #专用参数
        $data['Action']     = 'UpdateDomainRecord';
        $data['RecordId']   = RECORDID; #解析记录的ID，此参数在添加解析时会返回，在获取域名解析列表时会返回
        $data['RR']         = RR; #主机记录
        $data['Type']       = 'A';
        $data['Value']      = $ip;
        $data['TTL']        = 600;
        #$data['Priority']   = 10; #MX记录的优先级，取值范围[1,10]，记录类型为MX记录时，此参数必须
        $data['Line']       = 'default';
        #签名
        $data['Signature']  = 排序参数计算签名($data);
        #请求接口
        $json = 获取HTTP($api_url . http_build_query($data));
        $result = json_decode($json);
        
        #完成以后
        if(isset($result->RecordId)){
            file_put_contents(IP_FILE,$ip);
        }else{
            echo 'error';
            var_dump($result);
        }
    }else
    {
        echo 'IP没有发生变化，不需要修改解析记录';
    }
}
主函数();