MongoCursor::explain

(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) {
      }
    }
  }
}
doc_php
2016-02-24 16:20:42
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