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(mongodb >=1.0.0)
MongoDB\Driver\WriteConcern controls the acknowledgment of a write operation, specifies the level of write guarantee for Replica Sets.
$wstring 
   [,  integer $wtimeout 
   [,  boolean $journal 
   [,  boolean $fsync 
  ]]] )MongoDB\Driver\WriteConcern::MAJORITY  Majority of all the members in the set; arbiters, non-voting members, passive members, hidden members and delayed members are all included in the definition of majority write concern.