php使用COPY函数更新配置文件的方法

<?php
/*
 * file: _saveconfig.php
 * 
 * modified: 2010-7-11
 * by:liulang
 * 说明：涉及到两个文件：_saveconfig.php和config.php当对后台的一些全局配置变量进行更新时，
 * 就更改后台的config.php然后通过这个文件更改前台的config.php文件（前后台文件都一样）,
 * 这个是我曾经用过的一个方法，觉得还不错，拿出来与大家分享
 *
 * created: 2010-6-20
 * by: liulang (xujiaphp@gmail.com)
 * 
 */
  $srcfile = '../'.$drootdir.'#data/config.php';
  $dstfile = $drootdir.'config.php'; 
  $content = file_get_contents($srcfile);
  $arr = array
  (
     array('sitename', $gsite['sitename']),
     array('sitenameen', $gsite['sitenameen']),
     array('sitekeywords', $gsite['sitekeywords']),
     array('sitedescription', $gsite['sitedescription']),
     array('urlprefix', $gurlprefix),
     array('dbhost', $gdb['host']),
     array('dbuser', $gdb['user']),
     array('dbpwd', $gdb['pwd']),
     array('dbname', $gdb['db']),
     array('dbprefix', $gdb['prefix']),
     array('dir', $gupload['dir']),
     array('imagewidth', $gupload['imagewidth']),
     array('imageheight', $gupload['imageheight']),
     array('contactus', $contactus),
     array('menuhiddendiv', $menuhiddendiv),
     array('theme', $gtheme),
     array('date', date('y-m-d')),
     array('user', $dadminname)
   );
   for ($i = 0; $i < count($arr); $i++)
   {
    $content = str_replace('~`~'.$arr[$i][0].'~`~', $arr[$i][1], $content);
   } 
   copy($drootdir.'config.php', $drootdir.'bak.config.php');
   //copy($drootdir.'bak.config.php', '../'.$drootdir.'config.php');
   $done = file_put_contents($dstfile, $content);
   copy($dstfile, '../'.$drootdir.'config.php');
?>

<?php
/*
 * file: config.php
 * 
 * modified: 2010-09-20
 * by:admin
 * 
 * created: 2010-6-20
 * by: liulang (xujiaphp@gmail.com)
 * 
 */
  $gversion = '1.0';
  $gdb = array
  (
    'host' => 'localhost',   //主机名
    'user' => 'root',   //用户名
    'pwd' => '',    //密码
    'db' => 'sino',    //数据库名
    'prefix' => 'sin_'  //数据库前缀
  );
  $gsite = array
  (
    'sitename' => '公司名',   
    'sitenameen' => 'we are the company',  
    'sitekeywords' => '药物,医药,制药',  
    'sitedescription' => '公司名是一家从事00方面的公司' 
  );
  $gupload = array
  (
    'dir' => 'uploads',
    'imagewidth' => '120',
    'imageheight' => '*'  
  );
  $contactus = '';
  $menuhiddendiv = "";
  $fromurl=$_server["http_referer"]?$_server["http_referer"]:$http_server_vars["http_referer"];
  $drootdir = '../';
  $conn = mysql_connect($gdb['host'],$gdb['user'],$gdb['pwd']);
  mysql_select_db($gdb['db']) or die('database connect error!'); 
  mysql_query("set names 'gbk'"); 
?>