PHP中使用Elasticsearch

composer require elasticsearch/elasticsearch
会自动加载合适的版本！我的php是5.6的，它会自动加载5.3的elasticsearch版本！

Using version ^5.3 for elasticsearch/elasticsearch
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 4 installs, 0 updates, 0 removals
  - Installing react/promise (v2.7.0): Downloading (100%)         
  - Installing guzzlehttp/streams (3.0.0): Downloading (100%)         
  - Installing guzzlehttp/ringphp (1.1.0): Downloading (100%)         
  - Installing elasticsearch/elasticsearch (v5.3.2): Downloading (100%)         
Writing lock file
Generating autoload files
简单使用

<?php

class MyElasticSearch
{
    private $es;
    // 构造函数
    public function __construct()
    {
        include('../vendor/autoload.php');
        $params = array(
            '127.0.0.1:9200'
        );
        $this->es = \Elasticsearch\ClientBuilder::create()->setHosts($params)->build();
    }

    public function search() {
        $params = [
            'index' => 'megacorp',
            'type' => 'employee',
            'body' => [
                'query' => [
                    'constant_score' => [ //非评分模式执行
                        'filter' => [ //过滤器，不会计算相关度，速度快
                            'term' => [ //精确查找，不支持多个条件
                                'about' => '谭'
                            ]
                        ]

                    ]
                ]
            ]
        ];

        $res = $this->es->search($params);

        print_r($res);
    }
}
<?php
require "./MyElasticSearch.php";

$es = new MyElasticSearch();

$es->search();
执行结果

Array
(
    [took] => 2
    [timed_out] => 
    [_shards] => Array
        (
            [total] => 5
            [successful] => 5
            [skipped] => 0
            [failed] => 0
        )

    [hits] => Array
        (
            [total] => 1
            [max_score] => 1
            [hits] => Array
                (
                    [0] => Array
                        (
                            [_index] => megacorp
                            [_type] => employee
                            [_id] => 3
                            [_score] => 1
                            [_source] => Array
                                (
                                    [first_name] => 李
                                    [last_name] => 四
                                    [age] => 24
                                    [about] => 一个PHP程序员，热爱编程，谭康很帅，充满激情。
                                    [interests] => Array
                                        (
                                            [0] => 英雄联盟
                                        )

                                )

                        )

                )

        )

)
下面是官方的一些样例整合，

<?php

require '../vendor/autoload.php';
use Elasticsearch\ClientBuilder;
class MyElasticSearch
{
    private $client;
    // 构造函数
    public function __construct()
    {
        $params = array(
            '127.0.0.1:9200'
        );
        $this->client = ClientBuilder::create()->setHosts($params)->build();
    }

    // 创建索引
    public function create_index($index_name = 'test_ik') { // 只能创建一次
        $params = [
            'index' => $index_name,
            'body' => [
                'settings' => [
                    'number_of_shards' => 5,
                    'number_of_replicas' => 0
                ]
            ]
        ];

        try {
            return $this->client->indices()->create($params);
        } catch (Elasticsearch\Common\Exceptions\BadRequest400Exception $e) {
            $msg = $e->getMessage();
            $msg = json_decode($msg,true);
            return $msg;
        }
    }

    // 删除索引
    public function delete_index($index_name = 'test_ik') {
        $params = ['index' => $index_name];
        $response = $this->client->indices()->delete($params);
        return $response;
    }

    // 创建文档模板
    public function create_mappings($type_name = 'goods',$index_name = 'test_ik') {

        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'body' => [
                $type_name => [
                    '_source' => [
                        'enabled' => true
                    ],
                    'properties' => [
                        'id' => [
                            'type' => 'integer', // 整型
                            'index' => 'not_analyzed',
                        ],
                        'title' => [
                            'type' => 'string', // 字符串型
                            'index' => 'analyzed', // 全文搜索
                            'analyzer' => 'ik_max_word'
                        ],
                        'content' => [
                            'type' => 'string',
                            'index' => 'analyzed',
                            'analyzer' => 'ik_max_word'
                        ],
                        'price' => [
                            'type' => 'integer'
                        ]
                    ]
                ]
            ]
        ];

        $response = $this->client->indices()->putMapping($params);
        return $response;
    }

    // 查看映射
    public function get_mapping($type_name = 'goods',$index_name = 'test_ik') {
        $params = [
            'index' => $index_name,
            'type' => $type_name
        ];
        $response = $this->client->indices()->getMapping($params);
        return $response;
    }

    // 添加文档
    public function add_doc($id,$doc,$index_name = 'test_ik',$type_name = 'goods') {
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'id' => $id,
            'body' => $doc
        ];

        $response = $this->client->index($params);
        return $response;
    }

    // 判断文档存在
    public function exists_doc($id = 1,$index_name = 'test_ik',$type_name = 'goods') {
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'id' => $id
        ];

        $response = $this->client->exists($params);
        return $response;
    }


    // 获取文档
    public function get_doc($id = 1,$index_name = 'test_ik',$type_name = 'goods') {
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'id' => $id
        ];

        $response = $this->client->get($params);
        return $response;
    }

    // 更新文档
    public function update_doc($id = 1,$index_name = 'test_ik',$type_name = 'goods') {
        // 可以灵活添加新字段,最好不要乱添加
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'id' => $id,
            'body' => [
                'doc' => [
                    'title' => '苹果手机iPhoneX'
                ]
            ]
        ];

        $response = $this->client->update($params);
        return $response;
    }

    // 删除文档
    public function delete_doc($id = 1,$index_name = 'test_ik',$type_name = 'goods') {
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'id' => $id
        ];

        $response = $this->client->delete($params);
        return $response;
    }

    // 查询文档 (分页，排序，权重，过滤)
    public function search_doc($keywords = "电脑",$index_name = "test_ik",$type_name = "goods",$from = 0,$size = 2) {
        $params = [
            'index' => $index_name,
            'type' => $type_name,
            'body' => [
                'query' => [
                    'bool' => [
                        'should' => [
                            [ 'match' => [ 'title' => [
                                'query' => $keywords,
                                'boost' => 3, // 权重大
                            ]]],
                            [ 'match' => [ 'content' => [
                                'query' => $keywords,
                                'boost' => 2,
                            ]]],
                        ],
                    ],
                ],
                'sort' => ['price'=>['order'=>'desc']]
                , 'from' => $from, 'size' => $size
            ]
        ];

        $results = $this->client->search($params);
//        $maxScore  = $results['hits']['max_score'];
//        $score = $results['hits']['hits'][0]['_score'];
//        $doc   = $results['hits']['hits'][0]['_source'];
        return $results;
    }

}
<?php
require "./MyElasticSearch.php";

$es = new MyElasticSearch();

$r = $es->delete_index();

$r = $es->create_index();

$r = $es->create_mappings();

$r = $es->get_mapping();
print_r($r);

$docs = [];
$docs[] = ['id'=>1,'title'=>'苹果手机','content'=>'苹果手机，很好很强大。','price'=>1000];
$docs[] = ['id'=>2,'title'=>'华为手环','content'=>'荣耀手环，你值得拥有。','price'=>300];
$docs[] = ['id'=>3,'title'=>'小度音响','content'=>'智能生活，快乐每一天。','price'=>100];
$docs[] = ['id'=>4,'title'=>'王者荣耀','content'=>'游戏就玩王者荣耀，快乐生活，很好很强大。','price'=>998];
$docs[] = ['id'=>5,'title'=>'小汪糕点','content'=>'糕点就吃小汪，好吃看得见。','price'=>98];
$docs[] = ['id'=>6,'title'=>'小米手环3','content'=>'秒杀限量，快来。','price'=>998];
$docs[] = ['id'=>7,'title'=>'iPad','content'=>'iPad，不一样的电脑。','price'=>2998];
$docs[] = ['id'=>8,'title'=>'中华人民共和国','content'=>'中华人民共和国，伟大的国家。','price'=>19999];

foreach ($docs as $k => $v) {
    $r = $es->add_doc($v['id'],$v);
    print_r($r);
}

$r = $es->get_doc();

$r = $es->update_doc();

$r = $es->delete_doc();

$r = $es->exists_doc();


$r = $es->search_doc("手环 电脑");
$r = $es->search_doc("玩");
$r = $es->search_doc("中华");

print_r($r);