$rfr = $_SERVER['HTTP_REFERER']; //if(!$rfr) $rfr='http://'.$_SERVER['HTTP_HOST']; if($rfr) {  $p=parse_url($rfr);  parse_str($p['query'],$pa);  $p['host']=strtolower($p['host']);  $arr_sd_key=array(      'baidu.com'=>'word',      'google.com'=>'q',      'sina.com.cn'=>'word',      'sohu.com'=>'word',      'msn.com'=>'q',      'bing.com'=>'q',      '163.com'=>'q',      'yahoo.com'=>'p'      );  $keyword='';  $sengine=$p['host'];  foreach($arr_sd_key as $se=>$kwd)  {   if(strpos($p['host'],$se)!==false)   {    $keyword=$pa[$kwd];    $sengine=$se;    break;   }  }  $sql="insert into visit_log(domain,key_word,ct)"; }