谁能帮我解释下这些代码是什么意思

<?php  /*********************/  /* */  /* Version : 5.1.0 */  /* Author : RM */  /* Comment : 071223 */  /* */  /*********************/  define( "ROOTPATH", "" );  include( ROOTPATH."config.inc.php" );  include( ROOTPATH."language/".$sLan."_".$charset.".php" );  include( ROOTPATH."includes/SysGlobal.php" );  include( ROOTPATH."includes/pro.php" );  include( ROOTPATH."includes/func/common.inc.php" );  include( ROOTPATH."includes/func/db.inc.php" );  chklic( );  readconfig( );  $SiteName = $CONF['SiteName'];  $SiteHttp = $CONF['SiteHttp'];  $SiteEmail = $CONF['SiteEmail'];  $CatchOpen = $CONF['CatchOpen'];  $NowMenuid = "1";  $MenuInfo = menuinfo( $NowMenuid );  $MenuSecure = $MenuInfo['secure'];  menusecurecheck( $MenuSecure );  $PAGEINFO['coltype'] = "index";  $PAGEINFO['pagename'] = "index";  pageset( $PAGEINFO['coltype'], $PAGEINFO['pagename'] );  $PageTitle = pagedef( "", $PSET['pagetitle'] );  $MetaKey = pagedef( "", $PSET['metakey'] );  $MetaCon = pagedef( "", $PSET['metacon'] );  $PageTempStr = loadtemp( ROOTPATH."templates/".$MenuInfo['skin']."/header.html" );  $PageTempStr .= loadtemp( ROOTPATH."templates/".$MenuInfo['skin']."/".$PSET['tempfile'] );  $PageTempStr .= loadtemp( ROOTPATH."templates/".$MenuInfo['skin']."/foot.html" );  $PageAll = showtemp( $PageTempStr );  echo $PageAll;  buildhtml( "index", $PageAll );  ?>