PHP connections to NoSQL databases: MongoDB, Redis and more

Connect to NoSQL database in PHP: MongoDB: use MongoDB\Client class; Redis: use Redis class; Elasticsearch: use Elasticsearch\ClientBuilder class. Use Redis to cache WordPress pages: Create a Redis client; define a filter function to check whether the page exists in the cache; if it exists, output the cached page; otherwise, output the original page and cache it; enable cache filtering.

Connection of PHP to NoSQL database

NoSQL database (such as MongoDB, Elasticsearch, Redis) due to its flexibility, scalability and High-performance features are widely favored in modern application development. Here's how to connect to various NoSQL databases in PHP:

MongoDB

$client = new MongoDB\Client("mongodb://localhost:27017");
$db = $client->myDatabase; //选择数据库
$collection = $db->myCollection; //选择集合

Redis

$redis = new Redis();
$redis->connect('127.0.0.1', 6379); //连接Redis服务器

Elasticsearch

$client = Elasticsearch\ClientBuilder::create()->setHosts(['127.0.0.1:9200'])->build();

Practical case: Using Redis to cache WordPress pages

The following is how to use Redis to cache WordPress pages:

//获取Redis客户端
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

//创建过滤缓存的函数
function cache_filter_func($buffer) {
  global $redis;

  $url = $_SERVER['REQUEST_URI']; //获取当前URL

  //检查Redis缓存中是否存在页面
  $cached_page = $redis->get($url);

  //如果存在，则直接输出缓存页面
  if ($cached_page) {
    echo $cached_page;
  }

  //否则，输出原始页面并缓存起来
  else {
    $output = ob_get_contents(); //获取输出缓冲区内容
    ob_end_clean();

    //将页面写入Redis缓存
    $redis->set($url, $output);

    //输出原始页面
    echo $output;
  }
}

//启用缓存过滤
add_filter('wp_title_pri', 'my_cache_filter_func', 1);

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