惯用的php代码，hash，split，unset

<?php/** * * @author * @version $Id$ */// 这个php文件用到了大多数数据处理需要用的功能。#error_reporting("ALL");#$db = tdbm_popen("./id.words.tdbm", O_RDONLY, 0444, 0, 0);function getTitle($db,$id){            $relate = tdbm_fetch($db,$id);			            return $relate;}# 读取文件$file_handle = fopen("./new.fix", "r");$count =0;# 遍历文本文件中的行while (!feof($file_handle)) {    $line = fgets($file_handle);    #if($count >40)    #   return ;    #echo        $line = preg_replace("/\\n/","",$line);     #echo $line;     $arr = explode("
",$line);    if (count($arr)<2)        continue;    $query=$arr[0];    $ids=$arr[1];    $arrID = explode("",$ids);    $len=count($arrID);    $str="";    unset($hash);    for ($i=0; $i<$len; $i++)     {        $title=getTitle($db,$arrID[$i]);        $words = explode("",$title);        foreach($words as $word)        {            //echo $word;            //判断是不是在hash词典中            if( isset($hash[$word]))            {                $hash[$word] = $hash[$word]+1;            }            else            {                $hash[$word] =1 ;            }        }    }    $i=0;    //遍历hash数据结构    foreach ($hash as $key=>$val)    {        if( $i ==0)        {            $str=$key."\x03".$val;            $i =1;        }        else        {            $str = $str."\x02".$key."\x03".$val;        }           }    //字符串拼接    echo "qf
".$query."\x01".$str."\n";}fclose($file_handle);?>