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.ddpool.cn/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('lowercase' => TRUE,
'segment_english' => FALSE);
var $dict_name = 'Unknown';
var $dict_words = array();
function setLowercase($value) {
if ($value) {
$this->options['lowercase'] = TRUE;
} else {
$this->options['lowercase'] = FALSE;
}
return TRUE;
}
function setSegmentEnglish($value) {
if ($value) {
$this->options['segment_english'] = TRUE;
} else {
$this->options['segment_english'] = FALSE;
}
return TRUE;
}
function load($dict_file) {
if (!file_exists($dict_file)) {
return FALSE;
}
$fp = fopen($dict_file, 'r');
$temp = fgets($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 = 'Unknown';
}
$this->dict_name = $dict_name;
if ($dict_type !== 'DICT_WORD_W') {
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) {
$contents_segmented = '';
foreach ($lines as $line) {
$contents_segmented .= $this->_segmentLine(rtrim($line)) . " \n";
}
do {
$contents_segmented = str_replace(' ', ' ', $contents_segmented);
}
while (strpos($contents_segmented, ' ') !== FALSE);
return $contents_segmented;
}
function _segmentLine($str) {
$str_final = '';
$str_array = array();
$str_length = strlen($str);
if ($str_length > 0) {
if (ord($str{$str_length-1}) >= 129) {
$str .= ' ';
}
}
for ($i=0; $i
if (ord($str{$i}) >= 129) {
$str_array[] = $str{$i} . $str{$i+1};
$i++;
} else {
$str_tmp = $str{$i};
for ($j=$i+1; $j
if (ord($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['segment_english']) {
$str_final_tmp = preg_replace("/([\!\"\#\$\%\&\'()*+,-./:;&;=&;&;@[\\]^_`{|}~tf]+)/", " $1 ", $str_final_tmp);
$str_final_tmp = preg_replace("/([\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\&;\=\&;\&;\@\[\\\\\]\^\_\`\{\|\}\~\t\f])([\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\&;\=\&;\&;\@\[\\\\\]\^\_\`\{\|\}\~\t\f])/", " $1 $2 ", $str_final_tmp);
}
if ($this->options['lowercase']) {
$str_final_tmp = strtolower($str_final_tmp);
}
$str_final = " $str_final_tmp$str_final";
$pos--;
} else {
$word_found = 0;
$word_array = array(0 => '');
if ($pos < 4) {
$word_temp = $pos + 1;
} else {
$word_temp = 5;
}
for ($i=1; $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;
}
}
?>
希望本文所述对大家PHP程序设计有所帮助。 
