MongoDB - PHP - Retrieving a Document

MongoDB provides MongoCollection class to retrieve a document from a collection.

Syntax

// select a collection
$collection = $db->mycol;

$cursor = $collection->find();

// iterate cursor to display title of documents
foreach ($cursor as $document) {
  echo $document["title"] . "<br/>"
}

Selecting Document from a Collection

To select a document, we first need to connect to a database and then select the collection and then select and iterate the documents 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.<br/>";

      $cursor = $collection->find();

      // iterate cursor to display title of documents
      foreach ($cursor as $document) {
         echo $document["title"] . "<br/>";
      }
	  	  
   } catch (MongoDB\Driver\Exception\Exception $e) {	   
      echo "Exception:", $e->getMessage(), "\n";
   }
?>

Output

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

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

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