PHP实现抓取Google IP并自动修改hosts文件

PHP教程
<必修php
/**
 * 免翻墙上google
 * @author 自娱自乐自逍遥 <wapznw@gmail.com>
 * Date: 2015/2/6
 * Time: 11:42
*/
define('START_TAG','#google-hosts-2015');
define('END_TAG','#google-hosts-2015-end');
if(!empty($argv[1])){
 $params = array();
 parse_str($argv[1],$params);
if(isset($params['url'])){
 define('GOOGLE_HOST_URL',$params['url']);
}
if(isset($params['del'])){
define('DELETE_GOOGLE_HOST',true);
}
}
defined('GOOGLE_HOST_URL') || define('GOOGLE_HOST_URL','http://www.360kb.com/kb/2_150.html');
if(PHP_OS == 'WINNT'){
 define('HOSTS_FILE_PATH','C:WindowsSystem32driversetchosts');
}else if(in_array(PHP_OS,array('Linux','Darwin','FreeBSD','OpenBSD','WIN32','Windows','Unix'))){
 define('HOSTS_FILE_PATH','/etc/hosts');
}else{
 die('Unsupported system!'.PHP_EOL);
}
if(!is_writable(HOSTS_FILE_PATH)){
 die('Without permission,please use the root user to perform!'.PHP_EOL);
}
$hosts = file_get_contents(HOSTS_FILE_PATH);
$startPos = strpos($hosts,START_TAG);
if(!defined('DELETE_GOOGLE_HOST')){
 $gs = get_google_hosts();
 echo GOOGLE_HOST_URL.PHP_EOL;
 echo $gs.PHP_EOL;
}else{
 $gs = '';
 echo 'reset hosts'.PHP_EOL;
}
if($startPos){
 $_tmp = substr($hosts,$startPos,strpos($hosts,END_TAG) - $startPos + strlen(END_TAG));
 $hosts = str_replace($_tmp,$gs,$hosts);
}else{
 $hosts.= PHP_EOL.$gs;
}
$old_file_size = filesize(HOSTS_FILE_PATH);
if(file_put_contents(HOSTS_FILE_PATH,$hosts)){
 die('success. '.PHP_EOL);
}else{
die('fail'.PHP_EOL);
}
function get_google_hosts(){
 $html = file_get_contents(GOOGLE_HOST_URL);
 $html = strip_tags($html);
 $startPos = strpos($html,START_TAG);
 $html = substr($html,strpos($html,END_TAG) - $startPos);
 $html = str_replace('?',' ',$html);
 return $html.PHP_EOL.END_TAG;
}