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?>
<div id="ds-map.isempty" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Ds\Map::isEmpty</h1>
  <p class="verinfo">(PECL ds &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">Ds\Map::isEmpty</span> &mdash; <span class="dc-title">Returns whether the map is empty</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-ds-map.isempty-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Ds\Map::isEmpty</strong></span>(): <span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span></div>

  <p class="para rdfs-comment">
    Returns whether the map is empty.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-ds-map.isempty-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-ds-map.isempty-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 map is empty, <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> otherwise.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-ds-map.isempty-examples">
  <h3 class="title">示例</h3>
  <div class="example" id="example-4357">
   <p><strong>示例 #1 <span class="function"><strong>Ds\Map::isEmpty()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$a </span><span style="color: #007700">= new </span><span style="color: #0000BB">\Ds\Map</span><span style="color: #007700">([</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">3</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= new </span><span style="color: #0000BB">\Ds\Map</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">isEmpty</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">isEmpty</span><span style="color: #007700">());<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">bool(false)
bool(true)</pre>
</div>
   </div>
  </div>
 </div>



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