MongoDB\Driver\CursorInterface::isDead

说明

Checks whether the cursor may have additional results available to read. A cursor is initially "alive" but may become "dead" for any of the following reasons:

• Advancing a non-tailable cursor did not return a document
• The cursor encountered an error
• The cursor read its last batch to completion
• The cursor reached its configured limit

This is primarily useful with tailable cursors.