Safeness levels: Confirm change recorded in memory: %[ 'w' => 1 ];% Confirm inclusion in journal: %[ 'j' => true ];% Confirm committed to disk: %[ 'fsync' => true ];% Confirm replication: %[ 'w' => 2 ];% demo->talks; $c->insert( [ '_id' => 'mongodb' ], // document [ 'w' => 1 ] // options ); ?>]]> From 1.3: ]]>