(PECL mongo >=0.9.2)
MongoCursor::count — Counts the number of results for this query
$foundOnly = FALSE
] ) : intThis method does not affect the state of the cursor: if you haven't queried yet, you can still apply limits, skips, etc. If you have started iterating through results, it will not move the current position of the cursor. If you have exhausted the cursor, it will not reset it.
foundOnly
Send cursor limit and skip information to the count function, if applicable.
The number of documents returned by this cursor's query.
Example #1 MongoCursor::count() example
<?php
$collection->insert(array('x'=>1));
$collection->insert(array('x'=>2));
$collection->insert(array('x'=>3));
$cursor = $collection->find();
var_dump($cursor->count());
var_dump($cursor->count(true));
$cursor->limit(2);
var_dump($cursor->count());
var_dump($cursor->count(true));
?>
以上例程的输出类似于：
int(3) int(3) int(3) int(2)
Throws MongoConnectionException if it cannot reach the database.