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72 lines
2.1 KiB
HTML
72 lines
2.1 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>检查指定的 trait 是否存在</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.trait-exists" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">trait_exists</h1>
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<p class="verinfo">(PHP 5 >= 5.4.0, PHP 7)</p><p class="refpurpose"><span class="refname">trait_exists</span> — <span class="dc-title">检查指定的 trait 是否存在</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.trait-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>trait_exists</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$traitname</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$autoload</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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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.trait-exists-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">traitname</code></dt>
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<dd>
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<p class="para">
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待检查的 trait 的名称
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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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如果尚未加载，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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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.trait-exists-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果 trait 存在返回 <strong><code>TRUE</code></strong>，不存在则返回 <strong><code>FALSE</code></strong>。发生错误的时候返回 <strong><code>NULL</code></strong>。
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</p>
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</div>
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</div></div></div></body></html> |