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47 lines
4.0 KiB
HTML
47 lines
4.0 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>输出或返回一个变量的字符串表示</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.var-export" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">var_export</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">var_export</span> — <span class="dc-title">输出或返回一个变量的字符串表示</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.var-export-unknown-seealsp">
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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>var_export</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">$expression</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$return</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="simpara">
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此函数返回关于传递给该函数的变量的结构信息，它和
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<span class="function"><a href="var_dump.html" class="function">var_dump()</a></span> 类似，不同的是其返回的表示是合法的
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PHP 代码。
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</p>
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<p class="simpara">
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您可以通过将函数的第二个参数设置为
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<strong><code>TRUE</code></strong>，从而返回变量的表示。
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</p>
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<p class="simpara">
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比较 <span class="function"><strong>var_export()</strong></span> 和
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<span class="function"><a href="var_dump.html" class="function">var_dump()</a></span>.
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</p>
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<p class="para">
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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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<pre><br /><span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= array (</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, array (</span><span style="color: #DD0000">"a"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b"</span><span style="color: #007700">, </span><span style="color: #DD0000">"c"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_export </span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* 输出：<br />array (<br /> 0 => 1,<br /> 1 => 2,<br /> 2 => <br /> array (<br /> 0 => 'a',<br /> 1 => 'b',<br /> 2 => 'c',<br /> ),<br />)<br />*/<br /><br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= </span><span style="color: #0000BB">3.1</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$v </span><span style="color: #007700">= </span><span style="color: #0000BB">var_export</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #0000BB">TRUE</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$v</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* 输出：<br />3.1<br />*/<br /></span><span style="color: #0000BB">?><br /></span></pre></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></div></div></body></html> |