MongoDB - PHP - Getting/Selecting a Collection

MongoDB provides a way to get or select a collection using database as shown below.

Syntax

// select a database
$db = $client->myDb;
echo "<br/>Database myDb selected.";

$collection = $db->mycol;
echo "<br/>Collection selected succsessfully";

Selecting a Collection

To select a collection, we first need to connect to a database and then select the collection as shown below −

<?php
   require __DIR__ . '\vendor\autoload.php';
   try {
	  $uri = "mongodb://localhost:27017";
      // connect to mongodb
      $client = new MongoDB\Client($uri);
      echo "Connection to database successful.";
       // select a database
      $db = $client->myDb;
      echo "<br/>Database myDb selected.";
      $collection = $db->mycol;
      echo "<br/>Collection selected succsessfully.";
   } catch (MongoDB\Driver\Exception\Exception $e) {	   
      echo "Exception:", $e->getMessage(), "\n";
   }
?>

Output

Now, let's compile and run the above program to select a collection from our database myDb.

On executing, the above program gives you the following output.

Connection to database successful.
Database myDb selected.
Collection selected succsessfully.