我自定义的字典，词的权重不会发生改变呢 about jieba-php HOT 8 CLOSED

$content = "汽车行业巨头大众汽车最新公布2018年销售数据，全年共销售汽车624万辆，创历史新高。尽管如此，总体销量较2017年只是小幅增长0.2%，尤其是下半年受贸易问题和欧洲排放标准的影响，销量增速快速恶化。";

$tags = JiebaAnalyse::extractTags($content, 10);
var_dump($tags);

Jieba::loadUserDict(dirname(dirname(__FILE__)).'/dict/user_dict.txt');

$tags = JiebaAnalyse::extractTags($content, 10);
var_dump($tags);

JiebaAnalyse::$idf_freq['销售数据'] = 20;
$tags = JiebaAnalyse::extractTags($content, 10);
var_dump($tags);

array(10) {
  ["销量"]=>
  float(0.38517762539314)
  [624]=>
  float(0.34156478579714)
  ["0.2"]=>
  float(0.34156478579714)
  [2017]=>
  float(0.34156478579714)
  [2018]=>
  float(0.34156478579714)
  ["销售"]=>
  float(0.30390049575086)
  ["大众汽车"]=>
  float(0.284269540954)
  ["汽车行业"]=>
  float(0.24650508838314)
  ["尽管如此"]=>
  float(0.23087413490343)
  ["巨头"]=>
  float(0.21458391385457)
}
array(10) {
  ["销量"]=>
  float(0.39650637908118)
  [624]=>
  float(0.35161080890882)
  ["0.2"]=>
  float(0.35161080890882)
  [2017]=>
  float(0.35161080890882)
  [2018]=>
  float(0.35161080890882)
  ["销售数据"]=>
  float(0.35161080890882)
  ["大众汽车"]=>
  float(0.29263040980559)
  ["汽车行业"]=>
  float(0.25375523804147)
  ["尽管如此"]=>
  float(0.23766455063588)
  ["巨头"]=>
  float(0.22089520543853)
}
array(10) {
  ["销售数据"]=>
  float(0.58823529411765)
  ["销量"]=>
  float(0.39650637908118)
  [624]=>
  float(0.35161080890882)
  ["0.2"]=>
  float(0.35161080890882)
  [2017]=>
  float(0.35161080890882)
  [2018]=>
  float(0.35161080890882)
  ["大众汽车"]=>
  float(0.29263040980559)
  ["汽车行业"]=>
  float(0.25375523804147)
  ["尽管如此"]=>
  float(0.23766455063588)
  ["巨头"]=>
  float(0.22089520543853)
}

public static function setIdf($idf_path)
{
    $content = fopen($idf_path, "r");
    while (($line = fgets($content)) !== false) {
        $explode_line = explode(" ", trim($line));
        $word = $explode_line[0];
        $freq = $explode_line[1];
        $freq = (float) $freq;
        $idffreq[$word] = $freq;
        self::$idf_freq[$word] = $freq;
    }
    fclose($content);
    asort(self::$idf_freq);
    $keys = array_keys(self::$idf_freq);
    $middle_key = $keys[count(self::$idf_freq)/2];
    self::$max_idf = max(self::$idf_freq);
    self::$median_idf = self::$idf_freq[$middle_key];
}