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126 lines
5.4 KiB
HTML
126 lines
5.4 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>打印变量的相关信息</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-dump" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">var_dump</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">var_dump</span> — <span class="dc-title">打印变量的相关信息</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.var-dump-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>var_dump</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">$expression</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$...</code></span>
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] ) : <span class="type"><span class="type void">void</span></span></div>
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<p class="simpara">
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此函数显示关于一个或多个表达式的结构信息，包括表达式的类型与值。数组将递归展开值，通过缩进显示其结构。
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</p>
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<p class="simpara">
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In PHP 5 all public, private and protected properties of objects will be
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returned in the output.
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</p>
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<div class="tip"><strong class="tip">Tip</strong><p class="simpara">和直接将结果输出到浏览器一样，可使用<a href="book.outcontrol.html" class="link">输出控制函数</a>来捕获当前函数的输出，然后(例如)保存到一个 <span class="type"><a href="language.types.string.html" class="type string">string</a></span> 中。</p></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.var-dump-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">expression</code></dt>
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<dd>
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<p class="para">
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你要打印的变量。
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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.var-dump-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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没有返回值。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.var-dump-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-6375">
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<p><strong>Example #1 <span class="function"><strong>var_dump()</strong></span> 例子</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 />$a </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, array(</span><span style="color: #DD0000">"a"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b"</span><span style="color: #007700">, </span><span style="color: #DD0000">"c"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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array(3) {
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[0]=>
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int(1)
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[1]=>
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int(2)
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[2]=>
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array(3) {
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[0]=>
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string(1) "a"
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[1]=>
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string(1) "b"
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[2]=>
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string(1) "c"
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}
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}
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</pre></div>
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</div>
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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 /><br />$b </span><span style="color: #007700">= </span><span style="color: #0000BB">3.1</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">, </span><span style="color: #0000BB">$c</span><span style="color: #007700">);<br /><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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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float(3.1)
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bool(true)
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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 seealso" id="refsect1-function.var-dump-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="var_export.html" class="function" rel="rdfs-seeAlso">var_export()</a> - 输出或返回一个变量的字符串表示</span></li>
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<li class="member"><span class="function"><a href="print_r.html" class="function" rel="rdfs-seeAlso">print_r()</a> - 以易于理解的格式打印变量。</span></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> |