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121 lines
6.5 KiB
HTML
121 lines
6.5 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>为一个类创建别名</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.class-alias" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">class_alias</h1>
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<p class="verinfo">(PHP 5 >= 5.3.0, PHP 7)</p><p class="refpurpose"><span class="refname">class_alias</span> — <span class="dc-title">为一个类创建别名</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.class-alias-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>class_alias</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$original</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$alias</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$autoload</code><span class="initializer"> = <strong><code>TRUE</code></strong></span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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基于用户定义的类 <code class="parameter">original</code> 创建别名 <code class="parameter">alias</code>。
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这个别名类和原有的类完全相同。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.class-alias-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">original</code></dt>
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<dd>
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<p class="para">
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原有的类。
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</p>
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</dd>
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<dt>
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<code class="parameter">alias</code></dt>
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<dd>
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<p class="para">
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类的别名。
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</p>
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</dd>
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<dt>
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<code class="parameter">autoload</code></dt>
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<dd>
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<p class="para">
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如果原始类没有加载，是否使用自动加载（autoload）。
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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.class-alias-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.class-alias-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-6130">
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<p><strong>Example #1 <span class="function"><strong>class_alias()</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 /><br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{ }<br /><br /></span><span style="color: #0000BB">class_alias</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= new </span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= new </span><span style="color: #0000BB">bar</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// the objects are the same<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a </span><span style="color: #007700">== </span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #0000BB">$a </span><span style="color: #007700">=== </span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a </span><span style="color: #007700">instanceof </span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// the classes are the same<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a </span><span style="color: #007700">instanceof </span><span style="color: #0000BB">foo</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a </span><span style="color: #007700">instanceof </span><span style="color: #0000BB">bar</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b </span><span style="color: #007700">instanceof </span><span style="color: #0000BB">foo</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b </span><span style="color: #007700">instanceof </span><span style="color: #0000BB">bar</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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bool(true)
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bool(false)
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bool(true)
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bool(true)
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bool(true)
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bool(true)
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bool(true)
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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.class-alias-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_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_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> |