A PHP script that changes hosts

 define('HOST_FILE', 'C:WindowsSystem32driversetchosts');

 $hm = new HostManage(HOST_FILE);

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

 class HostManage {

 // hosts file path
 protected $file;
 // hosts record array
 protected $hosts = array();
 // Configuration file path, default is __FILE__ . '.ini';
 protected $configFile;
 // Configuration array read from ini configuration file
 protected $config = array();
 // The domain name that needs to be configured in the configuration file
 protected $domain = array();
 // The IP data obtained by the configuration file
 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;
 }

 /**
 * Delete the hosts of the domain in the configuration file
*/
 public function delAllGroup() {
 foreach ($this ->domain as $domain) {
 $this->delRecord($domain);
 }
 }

 /**
 * Configure the domain to the specified 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;
 }

 /**
 * Add a host record
 * @param type $ip
 * @param type $domain
*/
 function addRecord($domain, $ip) {
 $this->hosts[$domain] = $ ip;
 return $this;
 }

 /**
 * Delete a host record
 * @param type $domain
*/
 function delRecord($domain) {
 unset($this->hosts[$domain]);
 return $this;
 }

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

 }

Usage:

 php hosts.php local # The domain name will point to the local machine 127.0.0.1
 php hosts.php dev # The domain name will point to the development machine 192.168.1.100
 php hosts.php # Delete the hosts configuration of the domain name

hosts, PHP