(PECL mongo >=1.5.0)
Returns an array of cursors to iterator over a full collection in parallel
public array[MongoCommandCursor] MongoCollection::parallelCollectionScan ( int $num_cursors )
This method returns an array of a maximum of num_cursors cursors. An iteration over one of the returned cursors results in a partial set of documents for a collection. Iteration over all the returned cursors results in getting every document back from the collection.
This method is a wrapper for the parallelCollectionScan MongoDB command.
Parameters:
num_cursors
The number of cursors to request from the server. Please note, that the server can return less cursors than you requested.
Returns:
Returns an array of MongoCommandCursor objects.
Examples:
MongoCollection::parallelCollectionScan() example
Returning all documents in a collection by using multiple cursors.
<?php $m = new MongoClient; $c = $m->demo->cities; /* Request three cursors */ $cursors = $c->parallelCollectionScan( 3 ); /* Add all the cursors to the MultipleIterator */ $mi = new MultipleIterator( MultipleIterator::MIT_NEED_ANY ); foreach ( $cursors as $cursor ) { $mi->attachIterator( $cursor ); } /* Iterate over all the associated cursors */ foreach ( $mi as $items ) { foreach ( $items as $item ) { if ( $item !== NULL ) { echo $item['name'], "\n"; } } } ?>
See also:
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