post:|This will be used for the returned command result document.---arg_name:optionname:writeConcerntype::php:`MongoDB\\Driver\\WriteConcern <class.mongodb-driver-writeconcern>`
:manual:`Write concern </reference/write-concern>` to use for the operation.Defaults to the client's write concern.This is not supported for server versions prior to 3.4 and will result in anexception at execution time if used.interface:phpmethodoperation:~optional:true