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83 lines
5.1 KiB
HTML
83 lines
5.1 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>获取变量的类型</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.gettype" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gettype</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gettype</span> — <span class="dc-title">获取变量的类型</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-unknown-seealss" id="refsect1-function.gettype-unknown-unknown-unknown-unknown-seealss">
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<h3 class="title">描述</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>gettype</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">$var</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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返回 PHP 变量的类型
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<code class="parameter">var</code>.
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</p>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="simpara">
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不要使用 <span class="function"><strong>gettype()</strong></span>
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来测试某种类型，因为其返回的字符串在未来的版本中可能需要改变。此外，由于包含了字符串的比较，它的运行也是较慢的。
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</p>
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<p class="simpara">
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使用 <em>is_*</em> 函数代替。
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</p>
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</div>
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<p class="para">
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返回的字符串的可能值为：
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.boolean.html" class="type boolean">boolean</a></span>”（从 PHP 4 起）</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>”</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.float.html" class="type double">double</a></span>”（由于历史原因，如果是 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 则返回“double”，而不是“float”）</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.string.html" class="type string">string</a></span>”</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.array.html" class="type array">array</a></span>”</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.object.html" class="type object">object</a></span>”</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>”（从 PHP 4 起）</span>
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</li>
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<li class="listitem">
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<span class="simpara">“<span class="type"><a href="language.types.null.html" class="type NULL">NULL</a></span>”（从 PHP 4 起）</span>
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</li>
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<li class="listitem">
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<span class="simpara">“user function”（只用于 PHP 3，现已停用）</span>
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</li>
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<li class="listitem">
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<span class="simpara">“unknown type”</span>
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</li>
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</ul>
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</p>
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<p class="para">
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对于 PHP 4，你应该使用 <span class="function"><a href="function_exists.html" class="function">function_exists()</a></span>
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和 <span class="function"><a href="method_exists.html" class="function">method_exists()</a></span>
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取代先前将 <span class="function"><strong>gettype()</strong></span>
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作用于函数的用法。
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</p>
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<p class="para">
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参见
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<span class="function"><a href="settype.html" class="function">settype()</a></span>、<span class="function"><a href="is_array.html" class="function">is_array()</a></span>、<span class="function"><a href="is_bool.html" class="function">is_bool()</a></span>、<span class="function"><a href="is_float.html" class="function">is_float()</a></span>、<span class="function"><a href="is_integer.html" class="function">is_integer()</a></span>、<span class="function"><a href="is_null.html" class="function">is_null()</a></span>、<span class="function"><a href="is_numeric.html" class="function">is_numeric()</a></span>、<span class="function"><a href="is_object.html" class="function">is_object()</a></span>、<span class="function"><a href="is_resource.html" class="function">is_resource()</a></span>、<span class="function"><a href="is_scalar.html" class="function">is_scalar()</a></span>
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和 <span class="function"><a href="is_string.html" class="function">is_string()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |