(mongodb >=1.0.0)
MongoDB\Driver\WriteConcern::getW — Returns the WriteConcern's "w" option
此函数没有参数。
Returns the WriteConcern's "w" option.
示例 #1 MongoDB\Driver\WriteConcern::getW() example
<?php
$wc = new MongoDB\Driver\WriteConcern(1);
var_dump($wc->getW());
$wc = new MongoDB\Driver\WriteConcern(MongoDB\Driver\WriteConcern::MAJORITY);
var_dump($wc->getW());
?>以上示例会输出：
int(1) string(8) "majority"