一个更改 hosts 的 PHP 脚本

    define('HOST_FILE', 'C:\Windows\System32\drivers\etc\hosts');

    $hm = new HostManage(HOST_FILE);

    $env = $argv[1];
    if (empty($env)) {
            $hm->delAllGroup();
    } else {
            $hm->addGroup($env);
    }

    class HostManage {

            // hosts 文件路径
            protected $file;
            // hosts 记录数组
            protected $hosts = array();
            // 配置文件路径，默认为 __FILE__ . '.ini';
            protected $configFile;
            // 从 ini 配置文件读取出来的配置数组
            protected $config = array();
            // 配置文件里面需要配置的域名
            protected $domain = array();
            // 配置文件获取的 ip 数据
            protected $ip = array();

            public function __construct($file, $config_file = null) {
                    $this->file = $file;
                    if ($config_file) {
                        $this->configFile = $config_file;
                    } else {
                        $this->configFile = __FILE__ . '.ini';
                    }
                    $this->initHosts()
                            ->initCfg();
            }

            public function __destruct() {
                    $this->write();
            }

            public function initHosts() {
                    $lines = file($this->file);
                    foreach ($lines as $line) {
                            $line = trim($line);
                            if (empty($line) || $line[0] == '#') {
                                    continue;
                            }
                            $item = preg_split('/\s+/', $line);
                            $this->hosts[$item[1]] = $item[0];
                    }
                    return $this;
            }

            public function initCfg() {
                    if (! file_exists($this->configFile)) {
                            $this->config = array();
                    } else {
                            $this->config = (parse_ini_file($this->configFile, true));
                    }
                    $this->domain = array_keys($this->config['domain']);
                    $this->ip = $this->config['ip'];
                    return $this;
            }

            /**
             * 删除配置文件里域的 hosts
             */
            public function delAllGroup() {
                    foreach ($this->domain as $domain) {
                            $this->delRecord($domain);
                    }
            }

            /**
             * 将域配置为指定 ip
             * @param type $env
             * @return \HostManage
             */
            public function addGroup($env) {
                    if (! isset($this->ip[$env])) {
                            return $this;
                    }
                    foreach ($this->domain as $domain) {
                            $this->addRecord($domain, $this->ip[$env]);
                    }
                    return $this;
            }

            /**
             * 添加一条 host 记录
             * @param type $ip
             * @param type $domain
             */
            function addRecord($domain, $ip) {
                    $this->hosts[$domain] = $ip;
                    return $this;
            }

            /**
             * 删除一条 host 记录
             * @param type $domain
             */
            function delRecord($domain) {
                    unset($this->hosts[$domain]);
                    return $this;
            }

            /**
             * 写入 host 文件
             */
            public function write() {
                    $str = '';
                    foreach ($this->hosts as $domain => $ip) {
                            $str .= $ip . "\t" . $domain . PHP_EOL;
                    }
                    file_put_contents($this->file, $str);
                    return $this;
            }

    }

使用方法：

    php hosts.php local # 域名将指向本机 127.0.0.1
    php hosts.php dev # 域名将指向开发机 192.168.1.100
    php hosts.php # 删除域名的 hosts 配置

hosts, PHP