How to get a single value from MongoDB using PHP? - php

Question

So I have the following code to get a document from a collection in my database:
$manager = new MongoDB\Driver\Manager('mongodb+srv://<username>:<password>#cluster0.hyqa4.mongodb.net/academic?retryWrites=true&w=majority');
$filter = ['username' => $uname];
$options = ['projection' => ['_id' => 0]];
$query = new MongoDB\Driver\Query($filter, $options);
$cursor = $manager->executeQuery("academic.users", $query);
foreach($cursor as $document) {
print_r($document);
}
I'm able to successfully retrieve a document by searching for the username, so if $uname is "Jon", I get the following output:
stdClass Object ( [username] => Jon [email] => Jon#mail.com [passwd] => pass123 )
However, what I want to do is just return a single value from the document, so if I wanted to get the value for email, it would return:
Jon#mail.com
...so then I could store that value as a variable.
How would I do this?

Answer 1

Std class objects can be accessed via -> operator. So you can user $document->email to access individual email. Is this what you are looking for
$manager = new MongoDB\Driver\Manager('mongodb+srv://<username>:<password>#cluster0.hyqa4.mongodb.net/academic?retryWrites=true&w=majority');
$filter = ['username' => $uname];
$options = ['projection' => ['_id' => 0]];
$query = new MongoDB\Driver\Query($filter, $options);
$cursor = $manager->executeQuery("academic.users", $query);
foreach($cursor as $document) {
print_r($document->email);
}