Mastering MongoDB 4.x - Second Edition

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Querying an interface is similar to inserting and deleting, with the findOne() and find() methods used to retrieve the first result or all results of a query:

$document = $collection->findOne( array("isbn" => "401") );$cursor = $collection->find( array( "name" => new MongoDB\BSON\Regex("mongo", "i") ) );

In the second example, we are using a regular expression to search for a key name with the value, mongo (which is case insensitive).

Embedded documents can be queried using the . notation, as with the other languages that we examined earlier in this chapter:

$cursor = $collection->find( array('meta.price' => 50) );

We do this to query for a price embedded document inside the meta key field.

Similarly to Ruby and Python, in PHP, we can ...