(PECL mongo >=0.9.2)
Return an explanation of the query, often useful for optimization and debugging
public array MongoCursor::explain ( void )
Returns:
Returns an explanation of the query.
Exception:
Throws MongoConnectionException if it cannot reach the database.
Examples:
MongoCursor::explain() example
<?php $cursor = $collection->find(array("x"=>1), array("y")); $cursor->sort(array("z" => 1))->limit(4)->skip(5); var_dump($cursor->explain()); ?>
The above example will output something similar to:
array(8) { ["cursor"]=> string(15) "BtreeCursor x_1" ["startKey"]=> array(1) { ["x"]=> int(1) } ["endKey"]=> array(1) { ["x"]=> int(1) } ["nscanned"]=> float(4) ["n"]=> int(4) ["scanAndOrder"]=> int(1) ["millis"]=> int(3) ["allPlans"]=> array(2) { [0]=> array(3) { ["cursor"]=> string(15) "BtreeCursor x_1" ["startKey"]=> array(1) { ["x"]=> int(1) } ["endKey"]=> array(1) { ["x"]=> int(1) } } [1]=> array(3) { ["cursor"]=> string(11) "BasicCursor" ["startKey"]=> array(0) { } ["endKey"]=> array(0) { } } } }
Please login to continue.