我的系统是linux，根据老师提供的程序修改了config.php，出错信息为：Parse error:  syntax error, unexpected '$mainpath' (T_VARIABLE) in /var/www/c868c.cn/mr/12/config.php on line 3

我的网址为c868c.cn/mr/12

程序如下：

<?php
function getpath(){
 $mainpath=$_SERVER['DOCUMENT_ROOT'];
 $filepath=$_SERVER['SCRIPT_FILENAME'];
 $array=explode("/",$filepath);
 $newarray=array();
 for($i=0;$i<count($array)-1;$i++){
    array_push($newarray,$array[$i]."/");
    }
 $abspath=implode("",$newarray);
 $num=strlen($mainpath)-strlen($abspath);
 $newpathtmp=substr($abspath,$num);
 $newpath=$newpathtmp."Smarty/";
 return($newpath);
 }
$path=getpath();
define('BASE_PATH',$_SERVER['DOCUMENT_ROOT']);
define('SMARTY_PATH',$path);
require BASE_PATH.SMARTY_PATH.'libs/Smarty.class.php';
$smarty = new Smarty;
$smarty->template_dir = BASE_PATH.SMARTY_PATH.'templates/';
$smarty->compile_dir = BASE_PATH.SMARTY_PATH.'templates_c/';
$smarty->config_dir = BASE_PATH.SMARTY_PATH.'configs/';
$smarty->cache_dir = BASE_PATH.SMARTY_PATH.'cache/';

?>