之前介绍了DNSPod动态IP解析更新程序，是Python实现的。下面介绍一个PHP实现的脚本，实现了同样的动态域名解析功能。

<?php header("Content-type: text/html; charset=utf8"); class Dns { #Dnspod账户 private $dnspod_user = 'user@example.com'; #Dnspod密码 private $dnspod_pwd = 'password'; #Dnspod主域名，注意：是你注册的域名 private $domain = 'example.com'; #子域名，如www，如果要使用根域名，用@ private $sub_domain = 'www'; function getMyIp() { try { $ip = file_get_contents('http://www.leadnt.com/tools/ip.php'); return $ip; } catch(Exception $e) { echo $e->getMessage();
        return null;
    }
}

function api_call($api, $data) 
{
    if ($api == '' || !is_array($data)) {
    exit('内部错误：参数错误');
    }

    $api = 'https://dnsapi.cn/' . $api;
    $data = array_merge($data, array('login_email' => $this->dnspod_user, 'login_password' => $this->dnspod_pwd, 'format' => 'json', 'lang' => 'cn', 'error_on_empty' => 'no'));

    $result = $this->post_data($api, $data);
    if (!$result) {
    exit('内部错误：调用失败');
    }

    $results = @json_decode($result, 1);
    if (!is_array($results)) {
    exit('内部错误：返回错误');
    }

    if ($results['status']['code'] != 1) {
    exit($results['status']['message']);
    }

    return $results;
}

private function post_data($url, $data) 
{
    if ($url == '' || !is_array($data)) {
    return false;
    }

    $ch = @curl_init();
    if (!$ch) {
    exit('内部错误：服务器不支持CURL');
    }

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($ch, CURLOPT_USERAGENT, 'LocalDomains_PHP/1.0.0(roy@leadnt.com)');
    $result = curl_exec($ch);
    curl_close($ch);

    return $result;
}


public function exec()
{
    $ip = $this->getMyIp();
    $domainInfo = $this->api_call('domain.info',array('domain' => $this->domain));
    $domainId = $domainInfo['domain']['id'];
    $record = $this->api_call('record.list',array('domain_id'=> $domainId,'offset' =>'0','length' => '1','sub_domain' =>$this->sub_domain));
    if($record['info']['record_total'] == 0)
    {
        $this->api_call('record.create',
            array(
                'domain_id' => $domainId,
                'sub_domain' => $this->sub_domain,
                'record_type' => 'A',
                'record_line' => '默认',
                'value' => $ip,
                'ttl' => '3600'
                ));
    }
    else
    {
        if($record['records'][0]['value'] != $ip)
        {
            $this->api_call('record.modify',
            array(
                'domain_id' => $domainId,
                'record_id' => $record['records'][0]['id'],
                'sub_domain' => $this->sub_domain,
                'record_type' => 'A',
                'record_line' => '默认',
                'value' => $ip
                ));
        }
        else
        {
            echo '指向正常';
        }
    }
}
}
$dns = new Dns();
$dns->exec();
?>

sudo chmod 777 dnspod.php

加入到定时任务，每个小时执行一次。

vi /etc/crontab

*/55 * * * *  root  /usr/bin/php  /home/pi/dnspod.php  >>  /home/pi/dnspod.log   2>&1

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