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

 </div>

 <div class="refsect1 description" id="refsect1-ds-map.first-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Ds\Map::first</strong></span>(): <span class="type"><a href="class.ds-pair.php" class="type Ds\Pair">Ds\Pair</a></span></div>

  <p class="para rdfs-comment">
    Returns the first pair in the map.
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-ds-map.first-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.first-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
    The first pair in the map.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-ds-map.first-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   <span class="classname"><a href="class.underflowexception.php" class="classname">UnderflowException</a></span> if empty.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-ds-map.first-examples">
  <h3 class="title">示例</h3>
  <div class="example" id="example-4352">
   <p><strong>示例 #1 <span class="function"><strong>Ds\Map::first()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$map </span><span style="color: #007700">= new </span><span style="color: #0000BB">\Ds\Map</span><span style="color: #007700">([</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=&gt; </span><span style="color: #0000BB">3</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$map</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">first</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">object(Ds\Pair)#2 (2) {
  [&quot;key&quot;]=&gt;
  string(1) &quot;a&quot;
  [&quot;value&quot;]=&gt;
  int(1)
}</pre>
</div>
   </div>
  </div>
 </div>



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