SolrをPHPで使う(検索編)

前回の記事でSolrをPHPから使う準備ができました。
今回はPHPで Solr の検索を実行する方法です。

検索結果のオブジェクトは以下のような構造になっています。

SolrObject Object
(
    [responseHeader] => SolrObject Object
        (
            [zkConnected] => 1
            [status] => 0
            [QTime] => 0
            [params] => SolrObject Object
                (
                    [q] => *:*
                    [indent] => on
                    [start] => 0
                    [rows] => 2
                    [version] => 2.2
                    [wt] => xml
                )

        )

    [response] => SolrObject Object
        (
            [numFound] => 52
            [start] => 0
            [docs] => Array
                (
                    [0] => SolrDocument Object
                        (
                            [_hashtable_index:SolrDocument:private] => 24804
                        )

                    [1] => SolrDocument Object
                        (
                            [_hashtable_index:SolrDocument:private] => 5340
                        )

                )

        )

)

docs という配列の要素である SolrDocument オブジェクトは SolrDocumentField オブジェクトを複数含んでいます。SolrDocument 内のすべての SolrDocumentField をたどるために current() や next() などのメソッドを利用します。

SolrObject ベースの検索結果は意外と扱いづらいので、JSON で扱えるようにしてみます。

SolrClient 作成時のオプションとして wt=json を追加しています。

getRawResponse() の応答は以下の通りです。

{
  "responseHeader":{
    "zkConnected":true,
    "status":0,
    "QTime":0,
    "params":{
      "q":"*:*",
      "indent":"on",
      "start":"0",
      "rows":"2",
      "version":"2.2",
      "wt":"json"}},
  "response":{"numFound":52,"start":0,"numFoundExact":true,"docs":[
      {
        "id":"0553573403",
        "cat":["book"],
        "name":"A Game of Thrones",
        "price":7.99,
        "price_c":"7.99,USD",
        "inStock":true,
        "author":"George R.R. Martin",
        "author_s":"George R.R. Martin",
        "series_t":"A Song of Ice and Fire",
        "sequence_i":1,
        "genre_s":"fantasy",
        "_version_":1730974266238697472,
        "price_c____l_ns":799},
      {
        "id":"0553579908",
        "cat":["book"],
        "name":"A Clash of Kings",
        "price":7.99,
        "price_c":"7.99,USD",
        "inStock":true,
        "author":"George R.R. Martin",
        "author_s":"George R.R. Martin",
        "series_t":"A Song of Ice and Fire",
        "sequence_i":2,
        "genre_s":"fantasy",
        "_version_":1730974266279591936,
        "price_c____l_ns":799}]
  }}

これを json_decode() することで、通常の PHP 配列として扱うことができます。

Array
(
    [responseHeader] => Array
        (
            [zkConnected] => 1
            [status] => 0
            [QTime] => 0
            [params] => Array
                (
                    [q] => *:*
                    [indent] => on
                    [start] => 0
                    [rows] => 2
                    [version] => 2.2
                    [wt] => json
                )

        )

    [response] => Array
        (
            [numFound] => 52
            [start] => 0
            [numFoundExact] => 1
            [docs] => Array
                (
                    [0] => Array
                        (
                            [id] => 0553573403
                            [cat] => Array
                                (
                                    [0] => book
                                )

                            [name] => A Game of Thrones
                            [price] => 7.99
                            [price_c] => 7.99,USD
                            [inStock] => 1
                            [author] => George R.R. Martin
                            [author_s] => George R.R. Martin
                            [series_t] => A Song of Ice and Fire
                            [sequence_i] => 1
                            [genre_s] => fantasy
                            [_version_] => 1730974266238697472
                            [price_c____l_ns] => 799
                        )

                    [1] => Array
                        (
                            [id] => 0553579908
                            [cat] => Array
                                (
                                    [0] => book
                                )

                            [name] => A Clash of Kings
                            [price] => 7.99
                            [price_c] => 7.99,USD
                            [inStock] => 1
                            [author] => George R.R. Martin
                            [author_s] => George R.R. Martin
                            [series_t] => A Song of Ice and Fire
                            [sequence_i] => 2
                            [genre_s] => fantasy
                            [_version_] => 1730974266279591936
                            [price_c____l_ns] => 799
                        )

                )

        )

)