<?php
header("Content-Type:text/html;charset=utf-8");
$url = 'https://www.guojiz.com/'; 
//获取远程网页的编码
function _charset($url){
  $text = file_get_contents($url);
  $mode = '/charset=(.*)\"/iU';
  preg_match($mode,$text,$result);
  return $result[1];
}
$charset = _charset($url);//获取远程网页的编码
//以上为公用
//1：获取远程网页的标题，$url地址,$charset用于判断编码
function _title($url,$charset){
  $text = file_get_contents($url);
  //如果是gb2312编码处理乱码
  if ($charset == 'gb2312'){
   $text = iconv('gb2312','utf-8',$text);
  }
  $mode = '/<title>(.*)<\/title>/iU';
  preg_match($mode,$text,$result);
  return $result[1];
}
echo '网站标题：'.$title = _title($url,$charset); //获取远程网页的标题
//2：获取远程网页的简介
function _description($url,$charset){
  $text = file_get_contents($url);
  //gb2312编码乱码处理
  if ($charset == 'gb2312'){
   $text = iconv('gb2312','utf-8',$text);
  }
  $mode = '/<meta\s+name=\"description\"\s+content=\"(.*)\"\s?\/?>/iU';
  preg_match($mode,$text,$result);
  return $result[1];
}
echo '网站简介：'.$description = _description($url,$charset); //获取远程网页的简介

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