%*$set*% (sets a field to a new value) %*$unset*% (removes a field) %*$inc*% (increments the value in a field)

demo->circus; $c->remove(); $c->insert( [ '_id' => 'circ3', 'name' => 'Humberto', 'performers' => 12 ] ); $c->update( [ 'name' => 'Humberto' ], // query [ '$inc' => [ 'performers' => 4 ] ] // update spec ); var_dump( $c->findOne( [ 'name' => 'Humberto' ] ) ); ?>]]>