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<div id="class.mongodb-driver-serverdescription" class="reference">

 <h1 class="title">The MongoDB\Driver\ServerDescription class</h1>
 

 <div class="partintro"><p class="verinfo">(mongodb &gt;=1.13.0)</p>


  <div class="section" id="mongodb-driver-serverdescription.intro">
   <h2 class="title">简介</h2>
   <p class="simpara">
    The <span class="classname"><strong class="classname">MongoDB\Driver\ServerDescription</strong></span> class is a value
    object that represents a server to which the driver is connected. Instances
    of this class are returned by
    <span class="function"><a href="mongodb-driver-server.getserverdescription.php" class="function">MongoDB\Driver\Server::getServerDescription()</a></span> and
    <span class="classname"><a href="class.mongodb-driver-monitoring-serverchangedevent.php" class="classname">MongoDB\Driver\Monitoring\ServerChangedEvent</a></span> methods.
   </p>
  </div>


  <div class="section" id="mongodb-driver-serverdescription.synopsis">
   <h2 class="title">类摘要</h2>


   <div class="classsynopsis">
    <span class="ooclass"><strong class="classname"></strong></span>


    <div class="classsynopsisinfo">
     <span class="modifier">final</span>
     <span class="ooclass">
      <span class="modifier">class</span> <strong class="classname">MongoDB\Driver\ServerDescription</strong>
     </span>
     {</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 常量 */</div>
    <div class="fieldsynopsis">
     <span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-unknown"><var class="varname">TYPE_UNKNOWN</var></a></var><span class="initializer"> = &quot;Unknown&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-standalone"><var class="varname">TYPE_STANDALONE</var></a></var><span class="initializer"> = &quot;Standalone&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-mongos"><var class="varname">TYPE_MONGOS</var></a></var><span class="initializer"> = &quot;Mongos&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-possible-primary"><var class="varname">TYPE_POSSIBLE_PRIMARY</var></a></var><span class="initializer"> = &quot;PossiblePrimary&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-primary"><var class="varname">TYPE_RS_PRIMARY</var></a></var><span class="initializer"> = &quot;RSPrimary&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-secondary"><var class="varname">TYPE_RS_SECONDARY</var></a></var><span class="initializer"> = &quot;RSSecondary&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-arbiter"><var class="varname">TYPE_RS_ARBITER</var></a></var><span class="initializer"> = &quot;RSArbiter&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-other"><var class="varname">TYPE_RS_OTHER</var></a></var><span class="initializer"> = &quot;RSOther&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-ghost"><var class="varname">TYPE_RS_GHOST</var></a></var><span class="initializer"> = &quot;RSGhost&quot;</span>;</div>

    <div class="fieldsynopsis"><span class="modifier">const</span>
     <span class="type"><a href="language.types.string.php" class="type string">string</a></span>
      <var class="fieldsynopsis_varname"><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-load-balancer"><var class="varname">TYPE_LOAD_BALANCER</var></a></var><span class="initializer"> = &quot;LoadBalancer&quot;</span>;</div>


    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 方法 */</div>
    <div class="methodsynopsis dc-description">
   <span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.gethelloresponse.php" class="methodname">getHelloResponse</a></span>(): <span class="type"><a href="language.types.array.php" class="type array">array</a></span></div>
<div class="methodsynopsis dc-description"><span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.gethost.php" class="methodname">getHost</a></span>(): <span class="type"><a href="language.types.string.php" class="type string">string</a></span></div>
<div class="methodsynopsis dc-description"><span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.getlastupdatetime.php" class="methodname">getLastUpdateTime</a></span>(): <span class="type"><a href="language.types.integer.php" class="type int">int</a></span></div>
<div class="methodsynopsis dc-description"><span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.getport.php" class="methodname">getPort</a></span>(): <span class="type"><a href="language.types.integer.php" class="type int">int</a></span></div>
<div class="methodsynopsis dc-description"><span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.getroundtriptime.php" class="methodname">getRoundTripTime</a></span>(): <span class="type"><span class="type"><a href="language.types.null.php" class="type null">?</a></span><span class="type"><a href="language.types.integer.php" class="type int">int</a></span></span></div>
<div class="methodsynopsis dc-description"><span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">getType</a></span>(): <span class="type"><a href="language.types.string.php" class="type string">string</a></span></div>

   }</div>


  </div>


  <div class="section" id="mongodb-driver-serverdescription.constants">
   <h2 class="title">预定义常量</h2>
   <dl>

    
     <dt id="mongodb-driver-serverdescription.constants.type-unknown"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-unknown">MongoDB\Driver\ServerDescription::TYPE_UNKNOWN</a></code></strong></dt>
     <dd>
      <span class="simpara">Unknown server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-standalone"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-standalone">MongoDB\Driver\ServerDescription::TYPE_STANDALONE</a></code></strong></dt>
     <dd>
      <span class="simpara">Standalone server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-mongos"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-mongos">MongoDB\Driver\ServerDescription::TYPE_MONGOS</a></code></strong></dt>
     <dd>
      <span class="simpara">Mongos server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-possible-primary"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-possible-primary">MongoDB\Driver\ServerDescription::TYPE_POSSIBLE_PRIMARY</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set possible primary server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
      <span class="simpara">A server may be identified as a possible primary if it has not yet been checked but another memory of the replica set thinks it is the primary.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-rs-primary"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-primary">MongoDB\Driver\ServerDescription::TYPE_RS_PRIMARY</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set primary server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-rs-secondary"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-secondary">MongoDB\Driver\ServerDescription::TYPE_RS_SECONDARY</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set secondary server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-rs-arbiter"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-arbiter">MongoDB\Driver\ServerDescription::TYPE_RS_ARBITER</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set arbiter server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-rs-other"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-other">MongoDB\Driver\ServerDescription::TYPE_RS_OTHER</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set other server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
      <span class="simpara">Such servers may be hidden, starting up, or recovering. They cannot be queried, but their hosts lists are useful for discovering the current replica set configuration.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-rs-ghost"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-rs-ghost">MongoDB\Driver\ServerDescription::TYPE_RS_GHOST</a></code></strong></dt>
     <dd>
      <span class="simpara">Replica set ghost server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
      <span class="simpara">Servers may be identified as such in at least three situations: briefly during server startup; in an uninitialized replica set; or when the server is shunned (i.e. removed from the replica set config). They cannot be queried, nor can their host list be used to discover the current replica set configuration; however, the client may monitor this server in hope that it transitions to a more useful state.</span>
     </dd>
    

    
     <dt id="mongodb-driver-serverdescription.constants.type-load-balancer"><strong><code><a href="class.mongodb-driver-serverdescription.php#mongodb-driver-serverdescription.constants.type-load-balancer">MongoDB\Driver\ServerDescription::TYPE_LOAD_BALANCER</a></code></strong></dt>
     <dd>
      <span class="simpara">Load balancer server type, returned by <span class="methodname"><a href="mongodb-driver-serverdescription.gettype.php" class="methodname">MongoDB\Driver\ServerDescription::getType()</a></span>.</span>
     </dd>
    

   </dl>
  </div>


 </div>

 










































<h2>目录</h2><ul class="chunklist chunklist_reference"><li><a href="mongodb-driver-serverdescription.gethelloresponse.php">MongoDB\Driver\ServerDescription::getHelloResponse</a> — Returns the server's most recent &quot;hello&quot; response</li><li><a href="mongodb-driver-serverdescription.gethost.php">MongoDB\Driver\ServerDescription::getHost</a> — Returns the hostname of this server</li><li><a href="mongodb-driver-serverdescription.getlastupdatetime.php">MongoDB\Driver\ServerDescription::getLastUpdateTime</a> — Returns the server's last update time in microseconds</li><li><a href="mongodb-driver-serverdescription.getport.php">MongoDB\Driver\ServerDescription::getPort</a> — Returns the port on which this server is listening</li><li><a href="mongodb-driver-serverdescription.getroundtriptime.php">MongoDB\Driver\ServerDescription::getRoundTripTime</a> — Returns the server's round trip time in milliseconds</li><li><a href="mongodb-driver-serverdescription.gettype.php">MongoDB\Driver\ServerDescription::getType</a> — Returns a string denoting the type of this server</li></ul>
</div>
<?php manual_footer($setup); ?>