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php 获取系统当前路径与检查php配置参数
function getPath($mainpath, $relativepath) {
  global $dir;
  $mainpath_info           = explode("/", $mainpath);
  $relativepath_info       = explode("/", $relativepath);
  $relativepath_info_count = count($relativepath_info);
  for ($i=0; $i<$relativepath_info_count; $i++) {
   if ($relativepath_info[$i] == "." || $relativepath_info[$i] == "") continue;
   if ($relativepath_info[$i] == "..") {
    $mainpath_info_count = count($mainpath_info);
    unset($mainpath_info[$mainpath_info_count-1]);
    continue;
   }
   $mainpath_info[count($mainpath_info)] = $relativepath_info[$i];
  } //end for
  return implode("/", $mainpath_info);
 }

 // 检查PHP配置参数
 function getphpcfg($varname) {
  switch($result = get_cfg_var($varname)) {
   case 0:
   return "No";
   break;
   case 1:
   return "Yes";
   break;
   default:
   return $result;
   break;
  }
 }

本文来源：http://www.gdgbn.com/aspjiaocheng/22387/