php 获取来路[前一页]页面分析函数

php 获取来路[前一页]页面分析函数

本文章提供一款功能全面的获取上一级页面的函数哦，就是来路函数了。

function getref(&$ref,&$fullref) {
  global $err,$conf,$HTTP_GET_VARS,$_GET;

  if(isset($_GET['anr'])) $refer=$_GET['anr'];
  elseif(isset($HTTP_GET_VARS['anr'])) $refer=$HTTP_GET_VARS['anr'];
  else $refer='undefined';
  if(empty($refer)) $refer='undefined';
  if(!strcmp($refer,'null')) $refer='undefined';
  $refer=urldecode($refer);
  $refer=modsec($refer);
  $refer=txtproc($refer);

  //to correct back slashes            http://111cn.cnindex
  $refer=str_replace("","/",$refer);
  //to remove unnecessary points       http://111cn.cn.
  $refer=preg_replace("//./",'/',$refer);
  $refer=preg_replace("/.//",'/',$refer);
  $refer=preg_replace("/.*$/",'',$refer);
  $refer=preg_replace("/("|')*$/",'',$refer);
  //to remove unnecessary duplicates of slashes             http://111cn.cn///
  $refer=preg_replace("/([^:])(/)+/",'$1/',$refer);
  $fullref=$refer;

  $refer=preg_replace("/^(https?://)(www.)?/i",'',$refer);
  $ref=preg_replace("/[?|&|#|;].*$/i",'',$refer);
  $ref=preg_replace("/(/)*$/",'',$ref);
  $ref=trim($ref);
  $ref=preg_replace("/.*$/",'',$ref);
  $ref=preg_replace("/("|')*$/",'',$ref);
  $ref=trim($ref);

  //check referrer (bad)
  if(empty($ref)) $ref='undefined';
  //search "." in domain name
  if(!preg_match("/^([^./]+.)+([^./])+/i",$ref))  $ref='undefined';
}

}