PHP & MongoDB - Connecting Database

First step to do any operation is to create a Manager instance.

// Connect to MongoDB using Manager Instance
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");

Second step is to prepare and execute a command on a database if the database doesn't exist then MongoDB creates it automatically.

// Create a Command Instance
$statistics = new MongoDB\Driver\Command(["dbstats" => 1]);

// Execute the command on the database
$cursor = $manager->executeCommand("myDb", $statistics);

Example

Try the following example to connect to a MongoDB server −

Copy and paste the following example as mongodb_example.php −

<?php
   try {
      // connect to mongodb
      $manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");

      echo "Connection to database successfully";
      $statistics = new MongoDB\Driver\Command(["dbstats" => 1]);
      $cursor = $manager->executeCommand("myDb", $statistics);
      $statistics = current($cursor->toArray());
      echo "<pre>"; 
      print_r($statistics); 
      echo "</pre>";
   } catch (MongoDB\Driver\Exception\Exception $e) {	   
      echo "Exception:", $e->getMessage(), "\n";
   }
?>

Output

Access the mongodb_example.php deployed on apache web server and verify the output.

Connection to database successfully
stdClass Object
(
   [db] => myDb
   [collections] => 0
   [views] => 0
   [objects] => 0
   [avgObjSize] => 0
   [dataSize] => 0
   [storageSize] => 0
   [totalSize] => 0
   [indexes] => 0
   [indexSize] => 0
   [scaleFactor] => 1
   [fileSize] => 0
   [fsUsedSize] => 0
   [fsTotalSize] => 0
   [ok] => 1
)