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96 lines
4.2 KiB
HTML
96 lines
4.2 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>检查接口是否已被定义</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.interface-exists" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">interface_exists</h1>
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<p class="verinfo">(PHP 5 >= 5.0.2, PHP 7)</p><p class="refpurpose"><span class="refname">interface_exists</span> — <span class="dc-title">检查接口是否已被定义</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.interface-exists-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>interface_exists</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$interface_name</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$autoload</code><span class="initializer"> = true</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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检查接口是否已被定义。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.interface-exists-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">interface_name</code></dt>
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<dd>
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<p class="para">
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接口名。
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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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默认是否调用 <a href="language.oop5.autoload.html" class="link">__autoload</a>。
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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.interface-exists-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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本函数在由 <code class="parameter">interface_name</code>
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给出的接口已定义时返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.interface-exists-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-6146">
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<p><strong>Example #1 <span class="function"><strong>interface_exists()</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">// 在尝试使用前先检查接口是否存在<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">interface_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'MyInterface'</span><span style="color: #007700">)) {<br /> class </span><span style="color: #0000BB">MyClass </span><span style="color: #007700">implements </span><span style="color: #0000BB">MyInterface<br /> </span><span style="color: #007700">{<br /> </span><span style="color: #FF8000">// Methods<br /> </span><span style="color: #007700">}<br />}<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>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.interface-exists-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_declared_interfaces.html" class="function" rel="rdfs-seeAlso">get_declared_interfaces()</a> - 返回一个数组包含所有已声明的接口</span></li>
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<li class="member"><span class="function"><a href="class_implements.html" class="function" rel="rdfs-seeAlso">class_implements()</a> - 返回指定的类实现的所有接口。</span></li>
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<li class="member"><span class="function"><a href="class_exists.html" class="function" rel="rdfs-seeAlso">class_exists()</a> - 检查类是否已定义</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> |