在 PHP 中使用 CURL 查询 ElasticSearch 时遇到问题答案

【问题标题】：Trouble querying ElasticSearch with CURL in PHP在 PHP 中使用 CURL 查询 ElasticSearch 时遇到问题
【发布时间】：2019-04-13 21:17:07
【问题描述】：

我正在 AWS-EC2 实例上运行弹性搜索并尝试通过 curl 查询它，但似乎我的 curl_exec() 没有得到任何结果。当我尝试获得结果时，我得到以下结果

"Notice: Undefined offset: 0 in /var/www/html/DatabasePage.php on line 35" error


    function curlElastic(){

            $url = 'http://127.0.0.1:9200/resumes/test_resumes/_search/';
            $param = "
            {
                    'query' : {
                            'match' : {'degree type': 'Masters'}
            }";
            $header = array(
                    'Content-Type: application/json'
            );

            $ch = curl_init();
            curl_setopt($ch,CURLOPT_URL, $url);
            curl_setopt($ch,CURLOPT_HTTPHEADER, $header);
            curl_setopt($ch,CURLOPT_POSTFIELDS, $param);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $res = curl_exec($ch);
            curl_close($ch);
            return $res;
    }

     if (isset($_POST['search'])) {

            $data = curlElastic();
            $dataArr = json_decode($data, true);
            $result = count($dataArr[0]["hits"]);
            // gives "Notice: Undefined offset: 0 in /var/www/html/DatabasePage.php on line 35" error
    }

当我跑步时

curl -XGET "localhost:9200/resumes/test_resumes/_search"  -H 'Content-Type: application/json' -d '{"query":{"match":{"degree type": "Masters"}}}'

从命令行我得到结果

{"took":11,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":3,"max_score":0.9808292,"hits":[{"_index":"resumes","_type":"test_resumes","_id":"l5lqtWkBxgH_eRZOiK6d","_score":0.9808292,"_source":{"name": "David McDave", "degree type": "Masters", "degree field": "Compuer Security", "resume text": "I would like to work for you, I have many skills to provide! I can work with HTTP and Java"}},{"_index":"resumes","_type":"test_resumes","_id":"lJlotWkBxgH_eRZONK4V","_score":0.6931472,"_source":{"name": "David McDave", "degree type": "Masters", "degree field": "Compuer Security", "resume text": "I would like to work for you, I have many skills to provide! I can work with HTTP and Java"}},{"_index":"resumes","_type":"test_resumes","_id":"kZlhtWkBxgH_eRZOda7Q","_score":0.6931472,"_source":{"name": "David McDave", "degree type": "Masters", "degree field": "Compuer Security", "resume text": "I would like to work for you, I have many skills to provide! I can work with HTTP and Java"}}]}}

【问题讨论】：

您确认收到来自远程服务器的响应了吗？如果没有，您检查过curl_error() 吗？如果是这样，您是否使用过json_last_error() 来查看响应未正确解码的原因？
"Curl error:" "json last error: 0" 是我运行该代码时得到的结果
那么，$data_arr 是什么样的？这是这里的基本故障排除。
dataArr 为空，其中没有任何内容
运行stripslashes($res);给我这个： {"error":{"root_cause":[{"type":"json_parse_exception","reason":"Unexpected character (''' (code 39)): was expecting double-quote to start field namen在 [来源：org.elasticsearch.transport.netty4.ByteBufStreamInput@48cc8532；行：3，列：5]"}],"type":"json_parse_exception","reason":"意外字符（'''（代码 39 )): 期望双引号在 [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@48cc8532; line: 3, column: 5]"},"status":500} 开始字段名称

标签： php json curl

【解决方案1】：

    function curlElastic(){

            $url = 'http://localhost:9200/resumes/test_resumes/_search/';
            $param = array(
                    "query" => array(
                            "match" => array(
                                    "degree type" => "Masters"
                            )
                    )
            );
            $header = array(
                    'Content-Type: application/json'
            );
            $ch = curl_init();
            curl_setopt($ch,CURLOPT_URL, $url);
            curl_setopt($ch,CURLOPT_HTTPHEADER, $header);
            curl_setopt($ch,CURLOPT_POSTFIELDS, json_encode($param));
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $res = curl_exec($ch);
            if ($res === false) 
                    $res = 'curl error: ' . curl_error($ch);
            echo 'stripslashes: ' .  stripslashes($res);
            curl_close($ch);
            return $res;
    }
     if (isset($_POST['search'])) {
            $data = curlElastic();
            $dataArr = json_decode($data, true);
            $result = count($dataArr["hits"]);
    }

【讨论】：

【解决方案2】：

建议： ES 最好使用官方的 PHP 客户端 https://github.com/elastic/elasticsearch-php

不要试图重新发明轮子... :)

【讨论】：