前言：

在業務開發中，有一些面向C端的搜尋介面。比如根據商品名搜尋，之前也提過通過ES解決，但這次主要以一種較為簡單快捷的方式優化搜尋速度。

思路：

1. 通過程式將所有商品名進行分詞並冪集組合。
2. 將所有商品名稱冪集存入一張單獨的表中。
3. 每個分詞對應一個商品ID。
4. 搜尋關鍵詞對冪集表的分詞模糊查詢並取出商品ID。
5. 對應的商品ID就是搜尋出來的商品。

編碼：

1. 陣列元素的冪集函式。

if (!function_exists('powerSet')) {

    function powerSet($array)
    {

        $results = array(array());

        foreach ($array as $element) {

            foreach ($results as $combination) {

                $results[] = array_merge(array($element), $combination);

            }

        }

        return array_values($results);
    }
}
 

2. 搜尋分詞表建立。

3. 生成搜尋詞資料命令, 以後可通過php think make:name 執行。

<?php
namespace app\common\command;

use think\console\Command;
use think\console\Input;
use think\console\input\Argument;
use think\console\input\Option;
use think\console\Output;

use think\Db;


class MakeName extends Command{

    protected function configure(){

        $this->setName('make:name');
    }

    protected function execute(Input $input, Output $output){


        ini_set ('memory_limit', '512M');

        $output->info("===========BEGIN===========");


        $goods = Db::name("goods")->where("class_id",2)->cursor();
       

        foreach ($goods as  $goods_value) {

            $output->info("===========".$goods_value['goods_name']."===========");

            $goods_name = strtolower($goods_value['goods_name']);

            $name_array = explode(" ", $goods_name);
        
            $list = powerSet($name_array);

            $path = [];

            foreach ($list as  $value) {

                if(!count($value)) continue;

                $temp = array_reverse($value);

                $data['goods_id'] = $goods_value['id'];
                $data['search_path'] = implode("",$temp);
                $path[] = $data;
                $output->writeln($data['search_path']);
                unset($data);
            }


            Db::name("search")->where("goods_id",$goods_value['id'])->delete();

            Db::name("search")->insertAll($path);

            unset($path);
        }

        $output->info("===========END===========");
    }
}
 

4. 搜尋功能方法示例。

/**
 * @Notes:
 * @param string $keyWord 搜尋關鍵字
 * @param int $page 頁碼
 * @param int $size 每頁數量
 * @return array
 */
public function search($keyWord = '', $page = 1, $size = 10)
{
	$where = [];
	$where[] = $keyWord . '%';
	$where[] = str_replace(" ", "", $keyWord) . '%';
	$keyArr = explode(" ", $keyWord);
	foreach ($keyArr as $value) {
		$where[] = trim($value) . '%';
	}

	$ids = Db::name("search")->where("search_path", "like", $where, "OR")->column("goods_id");

	$ids = array_unique($ids);

	$goods = 0;
	$goods = Db::name("goods")->where("state", 1)->where("goods_name", "=", $keyWord)->value("id");
	if ($goods && $page == 1) {

		$key = array_search($goods, $ids);
		unset($ids[$key]);
	}

	$map[] = ['state', '=', 1];
	$map[] = ['delete_time', '=', 0];
	$map[] = ['id', 'in', $ids];

	$res = self::where($map)->field("id,goods_name")->order(['sort' => 'desc', 'id' => 'desc'])->page($page, $size)->select()->toArray();

	if ($goods && $page == 1) {
		if ($res) {
			$first = $res[0];
			$res[0] = ['id' => $goods, 'goods_name' => $keyWord];
			$res[] = $first;
		} else {
			$res[0] = ['id' => $goods, 'goods_name' => $keyWord];
		}

	}
	return $res;
}