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177 lines
11 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>返回对象或类的父类名</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-parent-class" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">get_parent_class</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">get_parent_class</span> — <span class="dc-title">返回对象或类的父类名</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.get-parent-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_parent_class</strong></span>
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([ <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$obj</code></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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如果 <code class="parameter">obj</code>
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是对象，则返回对象实例 <code class="parameter">obj</code>
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所属类的父类名。
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</p>
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<p class="para">
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如果 <code class="parameter">obj</code>
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是字符串，则返回以此字符串为名的类的父类名。此功能是在
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PHP 4.0.5 中增加的。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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自 PHP 5 起，如果在对象的方法内调用，则 <code class="parameter">obj</code> 为可选项。
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</p>
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</p></blockquote>
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<p class="para">
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<div class="example" id="example-6144">
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<p><strong>Example #1 使用 <span class="function"><strong>get_parent_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">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">dad</span><span style="color: #007700">()<br /> {<br /> </span><span style="color: #FF8000">// implements some logic<br /> </span><span style="color: #007700">}<br />}<br /><br />class </span><span style="color: #0000BB">child </span><span style="color: #007700">extends </span><span style="color: #0000BB">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">child</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"I'm " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_parent_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$this</span><span style="color: #007700">) , </span><span style="color: #DD0000">"'s son\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br />class </span><span style="color: #0000BB">child2 </span><span style="color: #007700">extends </span><span style="color: #0000BB">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">child2</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"I'm " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_parent_class</span><span style="color: #007700">(</span><span style="color: #DD0000">'child2'</span><span style="color: #007700">) , </span><span style="color: #DD0000">"'s son too\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= new </span><span style="color: #0000BB">child</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= new </span><span style="color: #0000BB">child2</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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I'm dad's son
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I'm dad's son too
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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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<p class="para">
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参见 <span class="function"><a href="get_class.html" class="function">get_class()</a></span> 和
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<span class="function"><a href="is_subclass_of.html" class="function">is_subclass_of()</a></span>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.get-parent-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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The tested object or class name
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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-parent-class-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the name of the parent class of the class of which
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<code class="parameter">object</code> is an instance or the name.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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If the object does not have a parent or the class given does not exist <strong><code>FALSE</code></strong> will be returned.
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</p>
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</p></blockquote>
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<p class="para">
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If called without parameter outside object, this function returns <strong><code>FALSE</code></strong>.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.get-parent-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>Before 5.1.0</td>
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<td>
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If called without parameter outside object, this function would have
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returned <strong><code>NULL</code></strong> with a warning.
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</td>
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</tr>
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<tr>
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<td>Since 5.0.0</td>
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<td>
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The <code class="parameter">object</code> parameter is optional if called
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from the object's method.
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</td>
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</tr>
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<tr>
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<td>Since 4.0.5</td>
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<td>
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If <code class="parameter">object</code> is a string, returns the name of the
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parent class of the class with that name.
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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-parent-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="example-6145">
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<p><strong>Example #2 Using <span class="function"><strong>get_parent_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">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">dad</span><span style="color: #007700">()<br /> {<br /> </span><span style="color: #FF8000">// implements some logic<br /> </span><span style="color: #007700">}<br />}<br /><br />class </span><span style="color: #0000BB">child </span><span style="color: #007700">extends </span><span style="color: #0000BB">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">child</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"I'm " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_parent_class</span><span style="color: #007700">(</span><span style="color: #0000BB">$this</span><span style="color: #007700">) , </span><span style="color: #DD0000">"'s son\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br />class </span><span style="color: #0000BB">child2 </span><span style="color: #007700">extends </span><span style="color: #0000BB">dad </span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">child2</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"I'm " </span><span style="color: #007700">, </span><span style="color: #0000BB">get_parent_class</span><span style="color: #007700">(</span><span style="color: #DD0000">'child2'</span><span style="color: #007700">) , </span><span style="color: #DD0000">"'s son too\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= new </span><span style="color: #0000BB">child</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= new </span><span style="color: #0000BB">child2</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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I'm dad's son
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I'm dad's son too
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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-parent-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_class.html" class="function" rel="rdfs-seeAlso">get_class()</a> - 返回对象的类名</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> |