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https://github.com/feixuekeji/PHPAnalysis

<?php
/**
 * @auther: xxf
 * Date: 2019/8/19
 * Time: 11:04
 */
namespace WordAnalysis;
/**
 * 中文分词提取关键字
 */
class Analysis{
 /**
 * Notes:关键字提取
 * @auther: xxf
 * Date: 2019/8/19
 * Time: 11:09
 * @param string $content
 * @param int $num 获取数量
 * @return string
 */
 public static function getKeywords($content = "",$num = 3) {
 if (empty ( $content )) {
 return '';
 }
 require_once 'phpanalysis.class.php';
 \PhpAnalysis::$loadInit = false;
 $pa = new \PhpAnalysis ( 'utf-8', 'utf-8', false );
 $pa->LoadDict ();
 $pa->SetSource ($content);
 $pa->StartAnalysis ( true );
 $tags = $pa->GetFinallyKeywords ($num); // 获取文章中的n个关键字
 return $tags;//返回关键字
 }
}

$data['seo']['keyword'] = Analysis::getKeywords($article_info['title']);