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41 lines
4.2 KiB
HTML
41 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>返回由所有已定义变量所组成的数组</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.get-defined-vars" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">get_defined_vars</h1>
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<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">get_defined_vars</span> — <span class="dc-title">
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返回由所有已定义变量所组成的数组
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</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.get-defined-vars-unknown-unknown-seealsq">
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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>get_defined_vars</strong></span>
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( <span class="methodparam">void</span>
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) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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此函数返回一个包含所有已定义变量列表的多维数组，这些变量包括环境变量、服务器变量和用户定义的变量。
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<div class="informalexample">
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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 />$b </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">,</span><span style="color: #0000BB">1</span><span style="color: #007700">,</span><span style="color: #0000BB">2</span><span style="color: #007700">,</span><span style="color: #0000BB">3</span><span style="color: #007700">,</span><span style="color: #0000BB">5</span><span style="color: #007700">,</span><span style="color: #0000BB">8</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$arr </span><span style="color: #007700">= </span><span style="color: #0000BB">get_defined_vars</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">// 打印 $b<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"b"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// 打印 PHP 解释程序的路径（如果 PHP 作为 CGI 使用的话）<br />// 例如：/usr/local/bin/php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"_"</span><span style="color: #007700">];<br /><br /></span><span style="color: #FF8000">// 打印命令行参数（如果有的话）<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"argv"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// 打印所有服务器变量<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"_SERVER"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// 打印变量数组的所有可用键值<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">array_keys</span><span style="color: #007700">(</span><span style="color: #0000BB">get_defined_vars</span><span style="color: #007700">()));<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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<p class="para">
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参见 <span class="function"><a href="get_defined_functions.html" class="function">get_defined_functions()</a></span> 和
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<span class="function"><a href="get_defined_constants.html" class="function">get_defined_constants()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |