Question

When I use a mongo DB cursor in php:

$Cursor = \MyDocument::find();

foreach ($Cursor as $Document)
    $Document->doSomething();

Is there then only left the last $Document in the memory or do I have to remove the built documents from the cursor object?

Answer 1

Basically, only $Document will be in memory which is the current one inside the foreach iteration.

As long as you’re not running into actual memory problems, I would leave it with this simplified description.

See as well: MongoDB – Why should I use a cursor instead of iterator_to_array (in PHP).

The MongoCursor class documentation explains this as well.