(PECL zookeeper >= 0.1.0)
Zookeeper::setDebugLevel — Sets the debugging level for the library
$logLevel
   ) : boollogLevelZooKeeper log level constants.
   成功时返回 TRUE, 或者在失败时返回 FALSE。
  
This method emits PHP error/warning when parameters count or types are wrong or fail to set debug level.
Since version 0.3.0, this method emits ZookeeperException and it's derivatives.
Example #1 Zookeeper::setDebugLevel() example
Set debugl level.
<?php
$r = Zookeeper::setDebugLevel(Zookeeper::LOG_LEVEL_WARN);
if ($r)
  echo 'SUCCESS';
else
  echo 'ERR';
?>
?>
以上例程会输出:
SUCCESS