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?>
<div id="splobjectstorage.valid" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SplObjectStorage::valid</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">SplObjectStorage::valid</span> &mdash; <span class="dc-title">Returns if the current iterator entry is valid</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-splobjectstorage.valid-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SplObjectStorage::valid</strong></span>(): <span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span></div>

  <p class="para rdfs-comment">
   Returns if the current iterator entry is valid.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-splobjectstorage.valid-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-splobjectstorage.valid-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 iterator entry is valid, <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> otherwise.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-splobjectstorage.valid-examples">
  <h3 class="title">示例</h3>
  <p class="para">
   <div class="example" id="example-3875">
    <p><strong>示例 #1 <span class="function"><strong>SplObjectStorage::valid()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$s </span><span style="color: #007700">= new </span><span style="color: #0000BB">SplObjectStorage</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$o1 </span><span style="color: #007700">= new </span><span style="color: #0000BB">stdClass</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$o2 </span><span style="color: #007700">= new </span><span style="color: #0000BB">stdClass</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">attach</span><span style="color: #007700">(</span><span style="color: #0000BB">$o1</span><span style="color: #007700">, </span><span style="color: #DD0000">"d1"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">attach</span><span style="color: #007700">(</span><span style="color: #0000BB">$o2</span><span style="color: #007700">, </span><span style="color: #DD0000">"d2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">rewind</span><span style="color: #007700">();<br />while(</span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">valid</span><span style="color: #007700">()) {<br />    echo </span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">key</span><span style="color: #007700">().</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />    </span><span style="color: #0000BB">$s</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">next</span><span style="color: #007700">();<br />}<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

    <div class="example-contents"><p>以上示例的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">0
1</pre>
</div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-splobjectstorage.valid-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li><span class="methodname"><a href="splobjectstorage.current.php" class="methodname" rel="rdfs-seeAlso">SplObjectStorage::current()</a> - Returns the current storage entry</span></li>
    <li><span class="methodname"><a href="splobjectstorage.getinfo.php" class="methodname" rel="rdfs-seeAlso">SplObjectStorage::getInfo()</a> - Returns the data associated with the current iterator entry</span></li>
   </ul>
  </p>
 </div>


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