中文分词 -- jieba

安装：
composer require fukuball/jieba-php

使用：

 <?php
 // 1. 引入包
 require_once "vendor/autoload.php";
 // 2. 使用命名空间
 use Fukuball\Jieba\Jieba;
 use Fukuball\Jieba\Finalseg;
 // 3. 设置内存大小
 ini_set('memory_limit', '1024M');
 // 4. 初始化对象
 Jieba::init();
 Finalseg::init();
 // 5. 使用分词
 $seg_list = Jieba::cutForSearch("小明硕士毕业于中国科学院计算所，后在日本京都大学深造Xiao Ming graduated from the Institute of Computing, Chinese Academy of Sciences, and later studied at Kyoto University, Japan.");
 // 6. 输出
 var_dump($seg_list);

输出：

 array(39) {
   [0]=>
   string(3) "小"
   [1]=>
   string(3) "明"
   [2]=>
   string(6) "硕士"
   [3]=>
   string(6) "毕业"
   [4]=>
   string(3) "于"
   [5]=>
   string(6) "中国"
   [6]=>
   string(6) "科学"
   [7]=>
   string(6) "学院"
   [8]=>
   string(9) "科学院"
   [9]=>
   string(15) "中国科学院"
   [10]=>
   string(6) "计算"
   [11]=>
   string(9) "计算所"
   [12]=>
   string(3) "，"
   [13]=>
   string(3) "后"
   [14]=>
   string(3) "在"
   [15]=>
   string(6) "日本"
   [16]=>
   string(6) "京都"
   [17]=>
   string(6) "大学"
   [18]=>
   string(18) "日本京都大学"
   [19]=>
   string(6) "深造"
   [20]=>
   string(4) "Xiao"
   [21]=>
   string(4) "Ming"
   [22]=>
   string(9) "graduated"
   [23]=>
   string(4) "from"
   [24]=>
   string(3) "the"
   [25]=>
   string(9) "Institute"
   [26]=>
   string(2) "of"
   [27]=>
   string(9) "Computing"
   [28]=>
   string(7) "Chinese"
   [29]=>
   string(7) "Academy"
   [30]=>
   string(2) "of"
   [31]=>
   string(8) "Sciences"
   [32]=>
   string(3) "and"
   [33]=>
   string(5) "later"
   [34]=>
   string(7) "studied"
   [35]=>
   string(2) "at"
   [36]=>
   string(5) "Kyoto"
   [37]=>
   string(10) "University"
   [38]=>
   string(6) "Japan."
 }