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RMM分词算法 PHP实现

Jun 06, 2016 pm 07:48 PM
php Participle accomplish algorithm

?php //RMM分词算法 class SplitWord{ var $TagDic = Array(); var $RankDic = Array(); var $SourceStr = ''; var $ResultStr = ''; var $SplitChar = ' '; //分隔符 var $SplitLen = 4; //保留词长度 var $MaxLen = 7; //词典最大中文字,这里的数值为字节

//RMM分词算法
class SplitWord{
 var $TagDic = Array();
 var $RankDic = Array();
 var $SourceStr = '';
 var $ResultStr = '';
 var $SplitChar = ' '; //分隔符
 var $SplitLen = 4;  //保留词长度
 var $MaxLen = 7;  //词典最大中文字,这里的数值为字节数组的最大索引
 var $MinLen = 3;  //最小中文字,这里的数值为字节数组的最大索引

  function SplitWord(){
   $this->__construct();
  }
 
  function __construct(){      
   //高级分词,预先载入词典以提分词高速度
   $dicfile = dirname(__FILE__)."/ppldic.csv";
   $fp = fopen($dicfile,'r');   //读取词库中的词
   while($line = fgets($fp,256)){
      $ws = explode(' ',$line);  //对词库中的词进行拆分
      $this->TagDic[$ws[0]] = $ws[1];
      $this->RankDic[strlen($ws[0])][$ws[0]] = $ws[2]; //??
   }
   fclose($fp);  //关闭词库文件
  }
 
  //释放资源
 function Clear(){
   @fclose($this->QuickDic);
  }
 
  //设置源字符串
  function SetSource($str){
   $this->SourceStr = $this->UpdateStr($str);
   $this->ResultStr = "";
  }
 
  //检查字符串是否不存在中文
  function NotGBK($str)
  {
    if($str=="") return "";
   if( ord($str[0])>0x80 ) return false;
   else return true;
  }

  //RMM分词算法
  function SplitRMM($str=""){
   if($str!="") $this->SetSource($str);
   if($this->SourceStr=="") return "";
   $this->SourceStr = $this->UpdateStr($this->SourceStr);
   $spwords = explode(" ",$this->SourceStr);
   $spLen = count($spwords);
   $spc = $this->SplitChar;
   for($i=($spLen-1);$i>=0;$i--){
    if($spwords[$i]=="") continue;
    if($this->NotGBK($spwords[$i])){
     if(ereg("[^0-9\.\+\-]",$spwords[$i]))
     { $this->ResultStr = $spwords[$i].$spc.$this->ResultStr; }
     else
     {
      $nextword = "";
      @$nextword = substr($this->ResultStr,0,strpos($this->ResultStr,""));
     }
    }
    else
    {
      $c = $spwords[$i][0].$spwords[$i][1];
      $n = hexdec(bin2hex($c));
       if(strlen($spwords[$i]) SplitLen)
       {
       }
       else
       {
        $this->ResultStr = $this->RunRMM($spwords[$i]).$spc.$this->ResultStr;
       }
     }
   }
   return $this->ResultStr;
  }
  //对全中文字符串进行逆向匹配方式分解
  function RunRMM($str){
   $spc = $this->SplitChar;
   $spLen = strlen($str);
   $rsStr = "";
   $okWord = "";
   $tmpWord = "";
   $WordArray = Array();
   //逆向字典匹配
   for($i=($spLen-1);$i>=0;){
    //当i达到最小可能词的时候
    if($iMinLen){
     if($i==1){
       $WordArray[] = substr($str,0,2);
      }else
     {
        $w = substr($str,0,$this->MinLen+1);
        if($this->IsWord($w)){
         $WordArray[] = $w;                                                                                 
        }else{
         $WordArray[] = substr($str,2,2);
         $WordArray[] = substr($str,0,2);
        }
      }
     $i = -1; break;
    }
    //分析在最小词以上时的情况
    if($i>=$this->MaxLen) $maxPos = $this->MaxLen;
    else $maxPos = $i;
    $isMatch = false;
    for($j=$maxPos;$j>=0;$j=$j-2){
      $w = substr($str,$i-$j,$j+1);
      if($this->IsWord($w)){
       $WordArray[] = $w;
       $i = $i-$j-1;
       $isMatch = true;
       break;
      }
    }
   }
   $rsStr = $this->otherword($WordArray);
   return $rsStr;
  }
 
function otherword($WordArray){
   $wlen = count($WordArray)-1;      //计算数组的元素个数
   $rsStr = "";          //初始化变量
   $spc = $this->SplitChar;
   for($i=$wlen;$i>=0;$i--)
   {
   $rsStr .= $spc.$WordArray[$i]."、";   //将数组为顿号进行拆分
   }
   //返回本段分词结果
  $rsStr = preg_replace("/^".$spc."/","、",$rsStr);
   return $rsStr;
  }
 
  //判断词典里是否存在某个词
  function IsWord($okWord){
   $slen = strlen($okWord);
   if($slen > $this->MaxLen) return false;
   else return isset($this->RankDic[$slen][$okWord]);
  }
 
  //整理字符串(对标点符号,中英文混排等初步处理)
  function UpdateStr($str){
   $spc = $this->SplitChar;
    $slen = strlen($str);
    if($slen==0) return '';
    $okstr = '';
    $prechar = 0; // 0-空白 1-英文 2-中文 3-符号
    for($i=0;$i      if(ord($str[$i])         //英文的空白符号
        if(ord($str[$i])           if($prechar!=0&&$str[$i]!="\r"&&$str[$i]!="\n") $okstr .= $spc;
          $prechar=0;
          continue;
        }else if(ereg("[^0-9a-zA-Z@\.%#:/\\&_-]",$str[$i])){
          if($prechar==0){ $okstr .= $str[$i]; $prechar=3;}
          else{ $okstr .= $spc.$str[$i]; $prechar=3;}
        }else{
         if($prechar==2||$prechar==3)
         { $okstr .= $spc.$str[$i]; $prechar=1;}
         else
         {
           if(ereg("@#%:",$str[$i])){ $okstr .= $str[$i]; $prechar=3; }
           else { $okstr .= $str[$i]; $prechar=1; }
         }
        }
      }
      else{
        //如果上一个字符为非中文和非空格,则加一个空格
        if($prechar!=0 && $prechar!=2) $okstr .= $spc;
        //如果中文字符
        if(isset($str[$i+1])){
          $c = $str[$i].$str[$i+1];
         
          $n = hexdec(bin2hex($c));
          if($n 0xAA40){
             if($prechar!=0) $okstr .= $spc.$c;
             else $okstr .= $c;
             $prechar = 3;
            }
          else{
            $okstr .= $c;
            $prechar = 2;
          }
          $i++;
        }
      }
    }
    return $okstr;
  }
}
?>

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