PHP采集程序中常用的函数

    //获得当前的脚本网址

    function get_php_url()

    {

      if(!empty($_SERVER[”REQUEST_URI”]))

      {

        $scriptName = $_SERVER[”REQUEST_URI”];

        $nowurl = $scriptName;

      }

      else

      {

        $scriptName = $_SERVER[”PHP_SELF”];

        if(empty($_SERVER[”QUERY_STRING”]))

          $nowurl = $scriptName;

        else

          $nowurl = $scriptName.”?”.$_SERVER[”QUERY_STRING”];

      }

      return $nowurl;

    }

    //把全角数字转为半角数字

    function GetAlabNum($fnum)

    {

      $nums = array(”０”,”１”,”２”,”３”,”４”,”５”,”６”,”７”,”８”,”９”);

      $fnums = “0123456789″;

      for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i],$fnums[$i],$fnum);

      $fnum = ereg_replace(”[^0-9/.]|^0{1,}”,””,$fnum);

      if($fnum==””) $fnum=0;

      return $fnum;

    }

    //去除HTML标记

    function Text2Html($txt)

    {

      $txt = str_replace(” “,”　”,$txt);

      $txt = str_replace(”<”,”<”,$txt);

      $txt = str_replace(”>”,”>”,$txt);

      $txt = preg_replace(”/[/r/n]{1,}/isU”,”<br/>/r/n”,$txt);

      return $txt;

    }

    //清除HTML标记

    function ClearHtml($str)

    {

      $str = str_replace(’<’,’<’,$str);

      $str = str_replace(’>’,’>’,$str);

      return $str;

    }

    //相对路径转化成绝对路径

    function relative_to_absolute($content, $feed_url)

    {

      preg_match(’/(http|https|ftp)://///’, $feed_url, $protocol);

      $server_url = preg_replace(”/(http|https|ftp|news)://///”, “”, $feed_url);

      $server_url = preg_replace(”///.*/”, “”, $server_url);

      if ($server_url == ”)

      {

        return $content;

      }

      if (isset($protocol[0]))

      {

        $new_content = preg_replace(’/href=”///’, ‘href=”‘.$protocol[0].$server_url.’/’, $content);

        $new_content = preg_replace(’/src=”///’, ’src=”‘.$protocol[0].$server_url.’/’, $new_content);

      }

      else

      {

        $new_content = $content;

      }

      return $new_content;

      }

      //取得所有链接

      function get_all_url($code){

      preg_match_all(’/<a/s+href=[”|/’]?([^>”/’ ]+)[”|/’]?/s*[^>]*>([^>]+)<//a>/i’,$code,$arr);

      return array(’name’=>$arr[2],’url’=>$arr[1]);

    }

    //获取指定标记中的内容

    function get_tag_data($str, $start, $end)

    {

      if ( $start == ” || $end == ” )

      {

        return;

      }

      $str = explode($start, $str);

      $str = explode($end, $str[1]);

      return $str[0];

    }

    //HTML表格的每行转为CSV格式数组

    function get_tr_array($table)

    {

      $table = preg_replace(”‘<td[^>]*?>’si”,’”‘,$table);

      $table = str_replace(”</td>”,’”,’,$table);

      $table = str_replace(”</tr>”,”{tr}”,$table);

      //去掉 HTML 标记

      $table = preg_replace(”‘<[///!]*?[^<>]*?>’si”,””,$table);

      //去掉空白字符

      $table = preg_replace(”‘([/r/n])[/s]+’”,””,$table);

      $table = str_replace(” “,””,$table);

      $table = str_replace(” “,””,$table);

        $table = explode(”,{tr}”,$table);

      array_pop($table);

      return $table;

    }

    //将HTML表格的每行每列转为数组，采集表格数据

    function get_td_array($table)

    {

      $table = preg_replace(”‘<table[^>]*?>’si”,””,$table);

      $table = preg_replace(”‘<tr[^>]*?>’si”,””,$table);

      $table = preg_replace(”‘<td[^>]*?>’si”,””,$table);

      $table = str_replace(”</tr>”,”{tr}”,$table);

      $table = str_replace(”</td>”,”{td}”,$table);

      //去掉 HTML 标记

      $table = preg_replace(”‘<[///!]*?[^<>]*?>’si”,””,$table);

      //去掉空白字符

      $table = preg_replace(”‘([/r/n])[/s]+’”,””,$table);

      $table = str_replace(” “,””,$table);

      $table = str_replace(” “,””,$table);

      $table = explode(’{tr}’, $table);

      array_pop($table);

      foreach ($table as $key=>$tr)

      {

        $td = explode(’{td}’, $tr);

        array_pop($td);

        $td_array[] = $td;

      }

      return $td_array;

    }

    //返回字符串中的所有单词 $distinct=true 去除重复

    function split_en_str($str,$distinct=true)

    {

      preg_match_all(’/([a-zA-Z]+)/’,$str,$match);

      if ($distinct == true)

      {

        $match[1] = array_unique($match[1]);

      }

      sort($match[1]);

      return $match[1];

    }