PHP中文分词介绍

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;
}