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<div id="ds-map.sort" class="refentry">
<div class="refnamediv">
<h1 class="refname">Ds\Map::sort</h1>
<p class="verinfo">(PECL ds >= 1.0.0)</p><p class="refpurpose"><span class="refname">Ds\Map::sort</span> — <span class="dc-title">
Sorts the map in-place by value
</span></p>
</div>
<div class="refsect1 description" id="refsect1-ds-map.sort-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><strong>Ds\Map::sort</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.callable.php" class="type callable">callable</a></span> <code class="parameter">$comparator</code><span class="initializer"> = ?</span></span>): <span class="type"><a href="language.types.void.php" class="type void">void</a></span></div>
<p class="para rdfs-comment">
Sorts the map in-place by value, using an optional <code class="parameter">comparator</code> function.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-ds-map.sort-parameters">
<h3 class="title">参数</h3>
<dl>
<dt><code class="parameter">comparator</code></dt>
<dd>
<p class="para">
在第一个参数小于，等于或大于第二个参数时，该比较函数必须相应地返回一个小于，等于或大于 0 的整数。
</p>
<div class="methodsynopsis dc-description"><span class="methodname"><span class="replaceable">callback</span></span>(<span class="methodparam"><span class="type"><a href="language.types.mixed.php" class="type mixed">mixed</a></span> <code class="parameter">$a</code></span>, <span class="methodparam"><span class="type"><a href="language.types.mixed.php" class="type mixed">mixed</a></span> <code class="parameter">$b</code></span>): <span class="type"><a href="language.types.integer.php" class="type int">int</a></span></div>
<div class="caution"><strong class="caution">警告</strong>
<p class="para">
从比较函数中返回<em>非整数</em>值，例如 <span class="type"><a href="language.types.float.php" class="type float">float</a></span>，将导致内部强制转换为 callback 返回值为
<span class="type"><a href="language.types.integer.php" class="type int">int</a></span>。因此，诸如 <code class="literal">0.99</code> 和 <code class="literal">0.1</code> 之类的值都将被转换为整数值
<code class="literal">0</code>，将这些值比较的话将会是相等。
</p>
</div>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-ds-map.sort-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
没有返回值。
</p>
</div>
<div class="refsect1 examples" id="refsect1-ds-map.sort-examples">
<h3 class="title">示例</h3>
<div class="example" id="example-4378">
<p><strong>示例 #1 <span class="function"><strong>Ds\Map::sort()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">$map</span><span style="color: #007700">-></span><span style="color: #0000BB">sort</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$map</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></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">Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => c
[value] => 1
)
[1] => Ds\Pair Object
(
[key] => a
[value] => 2
)
[2] => Ds\Pair Object
(
[key] => b
[value] => 3
)
)</pre>
</div>
</div>
</div>
<div class="example" id="example-4379">
<p><strong>示例 #2 <span class="function"><strong>Ds\Map::sort()</strong></span> example using a comparator</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$map </span><span style="color: #007700">= new </span><span style="color: #0000BB">\Ds\Map</span><span style="color: #007700">([</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /><br /></span><span style="color: #0000BB">$map</span><span style="color: #007700">-></span><span style="color: #0000BB">sort</span><span style="color: #007700">(function(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">$b </span><span style="color: #007700"><=> </span><span style="color: #0000BB">$a</span><span style="color: #007700">;<br />});<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$map</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div>
</div>
<div class="example-contents"><p>以上示例的输出类似于：</p></div>
<div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => b
[value] => 3
)
[1] => Ds\Pair Object
(
[key] => a
[value] => 2
)
[2] => Ds\Pair Object
(
[key] => c
[value] => 1
)
)</pre>
</div>
</div>
</div>
</div>
</div><?php manual_footer($setup); ?>