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147 lines
5.7 KiB
HTML
147 lines
5.7 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>设置变量的类型</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.settype" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">settype</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">settype</span> — <span class="dc-title">设置变量的类型</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.settype-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>settype</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 reference">&$var</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$type</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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将变量 <code class="parameter">var</code> 的类型设置成
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<code class="parameter">type</code>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.settype-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">var</code></dt>
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<dd>
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<p class="para">
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要转换的变量。
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</p>
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</dd>
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<dt>
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<code class="parameter">type</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">type</code> 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">
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“boolean” （或为“bool”，从 PHP 4.2.0 起）
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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“integer” （或为“int”，从 PHP 4.2.0 起）
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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“float” （只在 PHP 4.2.0 之后可以使用，对于旧版本中使用的“double”现已停用）
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"string"
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"array"
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"object"
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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“null” （从 PHP 4.2.0 起）
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</span>
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</li>
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</ul>
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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.settype-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.settype-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-6370">
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<p><strong>Example #1 <span class="function"><strong>settype()</strong></span> 示例</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 />$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"5bar"</span><span style="color: #007700">; </span><span style="color: #FF8000">// string<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #0000BB">true</span><span style="color: #007700">; </span><span style="color: #FF8000">// boolean<br /><br /></span><span style="color: #0000BB">settype</span><span style="color: #007700">(</span><span style="color: #0000BB">$foo</span><span style="color: #007700">, </span><span style="color: #DD0000">"integer"</span><span style="color: #007700">); </span><span style="color: #FF8000">// $foo 现在是 5 (integer)<br /></span><span style="color: #0000BB">settype</span><span style="color: #007700">(</span><span style="color: #0000BB">$bar</span><span style="color: #007700">, </span><span style="color: #DD0000">"string"</span><span style="color: #007700">); </span><span style="color: #FF8000">// $bar 现在是 "1" (string)<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 notes" id="refsect1-function.settype-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Maximum value for "int" is <strong><code>PHP_INT_MAX</code></strong>.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.settype-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="gettype.html" class="function" rel="rdfs-seeAlso">gettype()</a> - 获取变量的类型</span></li>
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<li class="member"><a href="language.types.type-juggling.html#language.types.typecasting" class="link">类型转换</a></li>
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<li class="member"><a href="language.types.type_juggling.html" class="link">类型戏法</a></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> |