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?>
<div id="mongodb-bson-document.has" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">MongoDB\BSON\Document::has</h1>
  <p class="verinfo">(mongodb &gt;=1.16.0)</p><p class="refpurpose"><span class="refname">MongoDB\BSON\Document::has</span> &mdash; <span class="dc-title">Returns whether a key is present in the document</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mongodb-bson-document.has-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><strong>MongoDB\BSON\Document::has</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.string.php" class="type string">string</a></span> <code class="parameter">$key</code></span>): <span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span></div>

 </div>


 <div class="refsect1 parameters" id="refsect1-mongodb-bson-document.has-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt><code class="parameter">key</code> (<span class="type"><a href="language.types.string.php" class="type string">string</a></span>)</dt>
    <dd>
     <p class="para">
      The key to look for in the document.
     </p>
    </dd>
   
  </dl>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mongodb-bson-document.has-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong> if the key is present in the document and <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> otherwise.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-mongodb-bson-document.has-errors">
  <h3 class="title">错误／异常</h3>
  <ul class="simplelist">
   <li>Throws <span class="classname"><a href="class.mongodb-driver-exception-invalidargumentexception.php" class="classname">MongoDB\Driver\Exception\InvalidArgumentException</a></span> on argument parsing errors.</li>
  </ul>
 </div>


 <div class="refsect1 seealso" id="refsect1-mongodb-bson-document.has-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li><span class="methodname"><a href="mongodb-bson-document.get.php" class="methodname" rel="rdfs-seeAlso">MongoDB\BSON\Document::get()</a> - Returns the value of a key in the document</span></li>
   <li><a href="https://www.mongodb.com/docs/manual/reference/bson-types/" class="link external">&raquo;&nbsp;BSON Types</a></li>
  </ul>
 </div>


</div><?php manual_footer($setup); ?>