PHP中文分词

PHP中文分词
最常见的词语二分法:
$str = '这是我的网站www.7di.net！';
//$str = iconv('GB2312','UTF-8',$str);
$result = spStr($str);
print_r($result);

/**
* UTF-8版 中文二元分词
*/
function spStr($str)
{
$cstr = array();

$search = array(",", "/", "\\", ".", ";", ":", "\"", "!", "~", "`", "^", "(", ")", "?", "-", "\t", "\n", "'", "<", ">", "\r", "\r\n", "{1}quot;", "&", "%", "#", "@", "+", "=", "{", "}", "[", "]", "：", "）", "（", "．", "。", "，", "！", "；", "“", "”", "‘", "’", "［", "］", "、", "—", "　", "《", "》", "－", "…", "【", "】",);

$str = str_replace($search, " ", $str);
preg_match_all("/[a-zA-Z]+/", $str, $estr);
preg_match_all("/[0-9]+/", $str, $nstr);

$str = preg_replace("/[0-9a-zA-Z]+/", " ", $str);
$str = preg_replace("/\s{2,}/", " ", $str);

$str = explode(" ", trim($str));

foreach ($str as $s) {
$l = strlen($s);

$bf = null;
for ($i= 0; $i< $l; $i=$i+3) {
$ns1 = $s{$i}.$s{$i+1}.$s{$i+2};
if (isset($s{$i+3})) {
$ns2 = $s{$i+3}.$s{$i+4}.$s{$i+5};
if (preg_match("/[\x80-\xff]{3}/",$ns2)) $cstr[] = $ns1.$ns2;
} else if ($i == 0) {
$cstr[] = $ns1;
}
}
}

$estr = isset($estr[0])?$estr[0]:array();
$nstr = isset($nstr[0])?$nstr[0]:array();

return array_merge($nstr,$estr,$cstr);
}

執行結果是:
Array ( [0] => 7 [1] => www [2] => di [3] => net [4] => 这是 [5] => 是我 [6] => 我的 [7] => 的网 [8] => 网站 )

接下来，将以上结果转换为区位码,PHP代码是：
foreach ($result as $s) {
$s = iconv('UTF-8','GB2312',$s);
$code[] = gbCode($s);
}
$code = implode(" ", $code);
echo $code;

function gbCode($str) {
$return = null;

if (!preg_match("/^[\x80-\xff]{2,}$/",$str)) return $str;

$len = strlen($str);
for ($i= 0; $i< $len; $i=$i+2) {
$return .= sprintf("%02d%02d",ord($str{$i})-160,ord($str{$i+1})-160);
}

return $return;
}

 

mysql指定了最小字符长度，默认是4，必须要匹配大于4的才会有返回结果，可以用SHOW VARIABLES LIKE 'ft_min_word_len' 来查看指定的字符长度，也可以在mysql配置文件my.ini 更改最小字符长度，方法是在my.ini 增加一行 比如：ft_min_word_len = 2，改完后重启mysql即可。
http://www.cnblogs.com/feichexia/archive/2012/06/09/2543049.html