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?>
<div id="ds-set.map" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Ds\Set::map</h1>
  <p class="verinfo">(PECL ds &gt;= 1.2.7)</p><p class="refpurpose"><span class="refname">Ds\Set::map</span> &mdash; <span class="dc-title">Returns the result of applying a callback to each value</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-ds-set.map-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Ds\Set::map</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.callable.php" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>): <span class="type"><a href="class.ds-set.php" class="type Ds\Set">Ds\Set</a></span></div>

  <p class="para rdfs-comment">
   Returns the result of applying a <code class="parameter">callback</code> function to
   each value in the set.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-ds-set.map-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt><code class="parameter">callback</code></dt>
    <dd>
     <p class="para">
      The callback to apply to each value in the set must have the following signature:
      <div class="methodsynopsis dc-description"><span class="methodname"><span class="replaceable">callback</span></span>(<span class="methodparam"><span class="type"><a href="language.types.mixed.php" class="type mixed">mixed</a></span> <code class="parameter">$value</code></span>): <span class="type"><a href="language.types.mixed.php" class="type mixed">mixed</a></span></div>

     </p>
    </dd>
   
  </dl>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-ds-set.map-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns a new <span class="classname"><a href="class.ds-set.php" class="classname">Ds\Set</a></span> instance where each value
   is the result of applying the <code class="parameter">callback</code> to each value
   of the set.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-ds-set.map-examples">
  <h3 class="title">示例</h3>
  <div class="example" id="example-4411">
   <p><strong>示例 #1 <span class="methodname"><strong>Ds\Set::map()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$set </span><span style="color: #007700">= new </span><span style="color: #0000BB">\Ds\Set</span><span style="color: #007700">([</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">]);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$set</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">map</span><span style="color: #007700">(function(</span><span style="color: #0000BB">$value</span><span style="color: #007700">) { return </span><span style="color: #0000BB">$value </span><span style="color: #007700">* </span><span style="color: #0000BB">2</span><span style="color: #007700">; }));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$set</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\Set)#3 (3) {
  [0]=&gt;
  int(2)
  [1]=&gt;
  int(4)
  [2]=&gt;
  int(6)
}
object(Ds\Set)#1 (3) {
  [0]=&gt;
  int(1)
  [1]=&gt;
  int(2)
  [2]=&gt;
  int(3)
}</pre>
</div>
   </div>
  </div>
 </div>


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