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167 lines
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HTML
167 lines
9.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>返回对象的类名</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.get-class" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">get_class</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">get_class</span> — <span class="dc-title">返回对象的类名</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.get-class-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>get_class</strong></span>
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([ <span class="methodparam"><span class="type">object</span> <code class="parameter">$object</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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返回对象实例 <code class="parameter">object</code> 所属类的名字。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.get-class-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">object</code></dt>
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<dd>
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<p class="para">
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要测试的对象。如果在类里，此参数可以省略。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.get-class-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回对象实例 <code class="parameter">object</code>
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所属类的名字。
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如果 <code class="parameter">object</code> 不是一个对象则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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如果在一个类里，省略了参数 <code class="parameter">object</code>，
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则返回当前所在类的名称。
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</p>
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<p class="para">
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如果 <code class="parameter">object</code> 是命名空间中某个类的实例，则会返回带上命名空间的类名。
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.get-class-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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如果用其他类型调用 <span class="function"><strong>get_class()</strong></span>，而不是一个对象的话，就会产生 <strong><code>E_WARNING</code></strong> 级别的错误。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.get-class-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.0 起</td>
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<td>
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<code class="parameter">object</code> 默认参数现在是 <strong><code>NULL</code></strong> ，所以，现在传入 <strong><code>NULL</code></strong> 到 <code class="parameter">object</code> 参数时，和没传参数的结果一样。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.get-class-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="function.usort.examples.object">
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<p><strong>Example #1 使用 <span class="function"><strong>get_class()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">name</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"My name is " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$this</span><span style="color: #007700">) , </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #FF8000">// create an object<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= new </span><span style="color: #0000BB">foo</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">// external call<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Its name is " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$bar</span><span style="color: #007700">) , </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// internal call<br /></span><span style="color: #0000BB">$bar</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Its name is foo
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My name is foo
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</pre></div>
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</div>
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</div>
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<div class="example" id="function.usort.examples.closure">
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<p><strong>Example #2 超类中使用 <span class="function"><strong>get_class()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">abstract class </span><span style="color: #0000BB">bar </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">()<br /> {<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">get_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$this</span><span style="color: #007700">));<br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">get_class</span><span style="color: #007700">());<br /> }<br />}<br /><br />class </span><span style="color: #0000BB">foo </span><span style="color: #007700">extends </span><span style="color: #0000BB">bar </span><span style="color: #007700">{<br />}<br /><br />new </span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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string(3) "foo"
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string(3) "bar"
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-6139">
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<p><strong>Example #3 命名空间中的类使用 <span class="function"><strong>get_class()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">namespace </span><span style="color: #0000BB">Foo</span><span style="color: #007700">\</span><span style="color: #0000BB">Bar</span><span style="color: #007700">;<br /><br />class </span><span style="color: #0000BB">Baz </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">()<br /> {<br /><br /> }<br />}<br /><br /></span><span style="color: #0000BB">$baz </span><span style="color: #007700">= new \</span><span style="color: #0000BB">Foo</span><span style="color: #007700">\</span><span style="color: #0000BB">Bar</span><span style="color: #007700">\</span><span style="color: #0000BB">Baz</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">get_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$baz</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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string(11) "Foo\Bar\Baz"
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.get-class-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="get_called_class.html" class="function" rel="rdfs-seeAlso">get_called_class()</a> - 后期静态绑定（"Late Static Binding"）类的名称</span></li>
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<li class="member"><span class="function"><a href="get_parent_class.html" class="function" rel="rdfs-seeAlso">get_parent_class()</a> - 返回对象或类的父类名</span></li>
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<li class="member"><span class="function"><a href="gettype.html" class="function" rel="rdfs-seeAlso">gettype()</a> - 获取变量的类型</span></li>
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<li class="member"><span class="function"><a href="is_subclass_of.html" class="function" rel="rdfs-seeAlso">is_subclass_of()</a> - 如果此对象是该类的子类，则返回 TRUE</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |