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196 lines
14 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>如果此对象是该类的子类，则返回 TRUE</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.is-subclass-of" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">is_subclass_of</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">is_subclass_of</span> — <span class="dc-title">如果此对象是该类的子类，则返回 <strong><code>TRUE</code></strong></span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.is-subclass-of-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>is_subclass_of</strong></span>
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( <span class="methodparam"><span class="type">object</span> <code class="parameter">$object</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$class_name</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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如果对象 <code class="parameter">object</code>
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所属类是类 <code class="parameter">class_name</code>
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的子类，则返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
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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 5.0.3 起也可以用一个字符串来指定 <code class="parameter">object</code>
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参数（类名）。
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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-6149">
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<p><strong>Example #1 <span class="function"><strong>is_subclass_of()</strong></span> 例子</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 /></span><span style="color: #FF8000">// define a class<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">WidgetFactory<br /></span><span style="color: #007700">{<br /> var </span><span style="color: #0000BB">$oink </span><span style="color: #007700">= </span><span style="color: #DD0000">'moo'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// define a child class<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">WidgetFactory_Child </span><span style="color: #007700">extends </span><span style="color: #0000BB">WidgetFactory<br /></span><span style="color: #007700">{<br /> var </span><span style="color: #0000BB">$oink </span><span style="color: #007700">= </span><span style="color: #DD0000">'oink'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// create a new object<br /></span><span style="color: #0000BB">$WF </span><span style="color: #007700">= new </span><span style="color: #0000BB">WidgetFactory</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$WFC </span><span style="color: #007700">= new </span><span style="color: #0000BB">WidgetFactory_Child</span><span style="color: #007700">();<br /><br />if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #0000BB">$WFC</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, \$WFC is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, \$WFC is not a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />}<br /><br />if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #0000BB">$WF</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, \$WF is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, \$WF is not a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// usable only since PHP 5.0.3<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #DD0000">'WidgetFactory_Child'</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, WidgetFactory_Child is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, WidgetFactory_Child is not a subclass of WidgetFactory\n"</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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yes, $WFC is a subclass of WidgetFactory
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no, $WF is not a subclass of WidgetFactory
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yes, WidgetFactory_Child is a subclass of WidgetFactory
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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="simpara">
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参见 <span class="function"><a href="get_class.html" class="function">get_class()</a></span>、
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<span class="function"><a href="get_parent_class.html" class="function">get_parent_class()</a></span> 和
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<span class="function"><a href="is_a.html" class="function">is_a()</a></span>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.is-subclass-of-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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A class name or an object instance
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</p>
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</dd>
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<dt>
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<code class="parameter">class_name</code></dt>
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<dd>
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<p class="para">
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The class name
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</p>
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</dd>
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<dt>
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<code class="parameter">allow_string</code></dt>
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<dd>
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<p class="para">
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If this parameter set to false, string class name as <code class="parameter">object</code>
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is not allowed. This also prevents from calling autoloader if the class doesn't exist.
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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.is-subclass-of-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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This function returns <strong><code>TRUE</code></strong> if the object <code class="parameter">object</code>,
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belongs to a class which is a subclass of
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<code class="parameter">class_name</code>, <strong><code>FALSE</code></strong> otherwise.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.is-subclass-of-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>5.3.9</td>
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<td>
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Added <code class="parameter">allow_string</code> parameter
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</td>
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</tr>
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<tr>
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<td>5.0.3</td>
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<td>
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You may also specify the <code class="parameter">object</code> parameter as a
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string (the name of the class)
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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.is-subclass-of-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-6150">
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<p><strong>Example #2 <span class="function"><strong>is_subclass_of()</strong></span> example</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 /></span><span style="color: #FF8000">// define a class<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">WidgetFactory<br /></span><span style="color: #007700">{<br /> var </span><span style="color: #0000BB">$oink </span><span style="color: #007700">= </span><span style="color: #DD0000">'moo'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// define a child class<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">WidgetFactory_Child </span><span style="color: #007700">extends </span><span style="color: #0000BB">WidgetFactory<br /></span><span style="color: #007700">{<br /> var </span><span style="color: #0000BB">$oink </span><span style="color: #007700">= </span><span style="color: #DD0000">'oink'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// create a new object<br /></span><span style="color: #0000BB">$WF </span><span style="color: #007700">= new </span><span style="color: #0000BB">WidgetFactory</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$WFC </span><span style="color: #007700">= new </span><span style="color: #0000BB">WidgetFactory_Child</span><span style="color: #007700">();<br /><br />if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #0000BB">$WFC</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, </span><span style="color: #0000BB">$WFC</span><span style="color: #DD0000"> is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, </span><span style="color: #0000BB">$WFC</span><span style="color: #DD0000"> is not a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />}<br /><br /><br />if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #0000BB">$WF</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, </span><span style="color: #0000BB">$WF</span><span style="color: #DD0000"> is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, </span><span style="color: #0000BB">$WF</span><span style="color: #DD0000"> is not a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />}<br /><br /><br /></span><span style="color: #FF8000">// usable only since PHP 5.0.3<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">is_subclass_of</span><span style="color: #007700">(</span><span style="color: #DD0000">'WidgetFactory_Child'</span><span style="color: #007700">, </span><span style="color: #DD0000">'WidgetFactory'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"yes, WidgetFactory_Child is a subclass of WidgetFactory\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"no, WidgetFactory_Child is not a subclass of WidgetFactory\n"</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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yes, $WFC is a subclass of WidgetFactory
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no, $WF is not a subclass of WidgetFactory
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yes, WidgetFactory_Child is a subclass of WidgetFactory
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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 notes" id="refsect1-function.is-subclass-of-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">如果此类不是已知类，使用此函数会使用任何已注册的
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<a href="language.oop5.autoload.html" class="link">autoloader</a>。</p></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.is-subclass-of-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="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="is_a.html" class="function" rel="rdfs-seeAlso">is_a()</a> - 如果对象属于该类或该类是此对象的父类则返回 TRUE</span></li>
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<li class="member"><span class="function"><a href="class_parents.html" class="function" rel="rdfs-seeAlso">class_parents()</a> - 返回指定类的父类。</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> |