Detailed explanation of examples of Chinese word segmentation using PHP-PHP Tutorial-php.cn

Detailed explanation of examples of Chinese word segmentation using PHP

怪我咯

Release： 2023-03-12 14:38:01

Original

1415 people have browsed it

这篇文章主要介绍了php实现的中文分词类,结合完整实例形式分析了php基于字符串的遍历、转换、运算等技巧实现中文分词功能的具体方法,需要的朋友可以参考下

本文实例讲述了php实现的中文分词类。分享给大家供大家参考，具体如下：

该中文分词类源码使用http://tools.jb51.net/code/jb51_php_format进行了格式化处理，便于阅读。具体代码如下：

class Segmentation {
  var $options = array(&#39;lowercase&#39; => TRUE, 
  &#39;segment_english&#39; => FALSE);
  var $dict_name = &#39;Unknown&#39;;
  var $dict_words = array();
  function setLowercase($value) {
    if ($value) {
      $this->options[&#39;lowercase&#39;] = TRUE;
    } else {
      $this->options[&#39;lowercase&#39;] = FALSE;
    }
    return TRUE;
  }
  function setSegmentEnglish($value) {
    if ($value) {
      $this->options[&#39;segment_english&#39;] = TRUE;
    } else {
      $this->options[&#39;segment_english&#39;] = FALSE;
    }
    return TRUE;
  }
  function load($dict_file) {
    if (!file_exists($dict_file)) {
      return FALSE;
    }
    $fp = fopen($dict_file, &#39;r&#39;);
    $temp = fgets($fp, 1024);
    if ($temp === FALSE) {
      return FALSE;
    } else {
      if (strpos($temp, "\t") !== FALSE) {
        list ($dict_type, $dict_name) = explode("\t", trim($temp));
      } else {
        $dict_type = trim($temp);
        $dict_name = &#39;Unknown&#39;;
      }
      $this->dict_name = $dict_name;
      if ($dict_type !== &#39;DICT_WORD_W&#39;) {
        return FALSE;
      }
    }
    while (!feof($fp)) {
      $this->dict_words[rtrim(fgets($fp, 32))] = 1;
    }
    fclose($fp);
    return TRUE;
  }
  function getDictName() {
    return $this->dict_name;
  }
  function segmentString($str) {
    if (count($this->dict_words) === 0) {
      return FALSE;
    }
    $lines = explode("\n", $str);
    return $this->_segmentLines($lines);
  }
  function segmentFile($filename) {
    if (count($this->dict_words) === 0) {
      return FALSE;
    }
    $lines = file($filename);
    return $this->_segmentLines($lines);
  }
  function _segmentLines($lines) {
    $contents_segmented = &#39;&#39;;
    foreach ($lines as $line) {
      $contents_segmented .= $this->_segmentLine(rtrim($line)) . " \n";
    }
    do {
      $contents_segmented = str_replace(&#39; &#39;, &#39; &#39;, $contents_segmented);
    }
    while (strpos($contents_segmented, &#39; &#39;) !== FALSE);
    return $contents_segmented;
  }
  function _segmentLine($str) {
    $str_final = &#39;&#39;;
    $str_array = array();
    $str_length = strlen($str);
    if ($str_length > 0) {
      if (ord($str{$str_length-1}) >= 129) {
        $str .= &#39; &#39;;
      }
    }
    for ($i=0; $i<$str_length; $i++) {
      if (ord($str{$i}) >= 129) {
        $str_array[] = $str{$i} . $str{$i+1};
        $i++;
      } else {
        $str_tmp = $str{$i};
        for ($j=$i+1; $j<$str_length; $j++) {
          if (ord($str{$j}) < 129) {
            $str_tmp .= $str{$j};
          } else {
            break;
          }
        }
        $str_array[] = array($str_tmp);
        $i = $j - 1;
      }
    }
    $pos = count($str_array);
    while ($pos > 0) {
      $char = $str_array[$pos-1];
      if (is_array($char)) {
        $str_final_tmp = $char[0];
        if ($this->options[&#39;segment_english&#39;]) {
          $str_final_tmp = preg_replace("/([\!\"\#\$\%\&\&#39;\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\\\]\^\_\`\{\|\}\~\t\f]+)/", " $1 ", $str_final_tmp); 
$str_final_tmp = preg_replace("/([\!\"\#\$\%\&\&#39;\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\\\]\^\_\`\{\|\}\~\t\f])([\!\"\#\$\%\&\&#39;\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\\\]\^\_\`\{\|\}\~\t\f])/", " $1 $2 ", $str_final_tmp);
        }
        if ($this->options[&#39;lowercase&#39;]) {
          $str_final_tmp = strtolower($str_final_tmp);
        }
        $str_final = " $str_final_tmp$str_final";
        $pos--;
      } else {
        $word_found = 0;
        $word_array = array(0 => &#39;&#39;);
        if ($pos < 4) {
          $word_temp = $pos + 1;
        } else {
          $word_temp = 5;
        }
        for ($i=1; $i<$word_temp; $i++) {
          $word_array[$i] = $str_array[$pos-$i] . $word_array[$i-1];
        }
        for ($i=($word_temp-1); $i>1; $i--) {
          if (array_key_exists($word_array[$i], $this->dict_words)) {
            $word_found = $i;
            break;
          }
        }
        if ($word_found) {
          $str_final = " $word_array[$word_found]$str_final";
          $pos = $pos - $word_found;
        } else {
          $str_final = " $char$str_final";
          $pos--;
        }
      }
    }
    return $str_final;
  }
}
?>

Copy after login

The above is the detailed content of Detailed explanation of examples of Chinese word segmentation using PHP. For more information, please follow other related articles on the PHP Chinese website!