PHP采集程序中常用的函数

来源：互联网发布：人工智能对社会的影响编辑：程序博客网时间：2024/05/17 02:21

    //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];
    }