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is_writable("data/config.php");
is_writable() ¼ì²éÎļþÊÇ·ñ¿Éд£¬ÓÃÀ´ÅжÏÎļþ£¬Í¬ÀຯÊý»¹ÓÐis_readable()¼ì²éÎļþÊÇ·ñ¿É¶Á£¬·µ»Ø²¼¶ûÖµ¡£
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<?php
$file="config.php";
if (!is_writable($file))
{
echo "<font color=red>²»¿Éд</font>";
}
else
{ echo "<strong><font color=green>¿Éд</font></strong>";
}
if (isset($_POST[install]))
{  $config_str="<?php";
   $config_str.="\n";//ÕâÊÇ»»Ðзû
   $config_str.='$hostname="'.$_POST[hostname].'";';
   $config_str.="\n";//ÕâÊÇ»»Ðзû
   $config_str.='$dbuser="'.$_POST[dbuser].'";';
   $config_str.="\n";//ÕâÊÇ»»Ðзû
   $config_str.='$dbpasswd="'.$_POST[dbpasswd].'";';
   $config_str.="\n";
   $config_str.='$dbname="'.$_POST[dbname].'";';
   $config_str.="\n";
   $config_str.='$dbprefix="'.$_POST[dbprefix].'";';//Êý¾Ý¿âǰ׺
   $config_str.="\n";
   $config_str.="?>";
   $f_open=fopen($file,"w+");
   fwrite($f_open ,$config_str);
   include_once("config.php");
  if (! @$link=mysql_connect($hostname,$dbuser,$dbpasswd))
 {
   echo "Êý¾Ý¿âÁ¬½Óʧ°Ü£¡<


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