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131 lines
6.3 KiB
HTML
131 lines
6.3 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>交换数组中的键和值</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.array-flip" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_flip</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_flip</span> — <span class="dc-title">交换数组中的键和值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-flip-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>array_flip</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span>
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) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>array_flip()</strong></span> 返回一个反转后的 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>，例如
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<code class="parameter">array</code> 中的键名变成了值，而
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<code class="parameter">array</code> 中的值成了键名。
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</p>
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<p class="para">
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注意 <code class="parameter">array</code> 中的值需要能够作为合法的键名（例如需要是
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<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 或者 <span class="type"><a href="language.types.string.html" class="type string">string</a></span>）。如果类型不对，将出现一个警告，并且有问题的键／值对<em class="emphasis">将不会出现在结果里</em>。
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</p>
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<p class="para">
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如果同一个值出现多次，则最后一个键名将作为它的值，其它键会被丢弃。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-flip-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">array</code></dt>
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<dd>
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<p class="para">
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要交换键/值对的数组。
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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.array-flip-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回交换后的数组，如果失败返回 <strong><code>NULL</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-flip-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-6030">
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<p><strong>Example #1 <span class="function"><strong>array_flip()</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 />$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"oranges"</span><span style="color: #007700">, </span><span style="color: #DD0000">"apples"</span><span style="color: #007700">, </span><span style="color: #DD0000">"pears"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$flipped </span><span style="color: #007700">= </span><span style="color: #0000BB">array_flip</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$flipped</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Array
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(
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[oranges] => 0
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[apples] => 1
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[pears] => 2
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)
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-6031">
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<p><strong>Example #2 <span class="function"><strong>array_flip()</strong></span> 例子 : 冲突</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$flipped </span><span style="color: #007700">= </span><span style="color: #0000BB">array_flip</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$flipped</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
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(
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[1] => b
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[2] => c
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)
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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.array-flip-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="array_values.html" class="function" rel="rdfs-seeAlso">array_values()</a> - 返回数组中所有的值</span></li>
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<li class="member"><span class="function"><a href="array_keys.html" class="function" rel="rdfs-seeAlso">array_keys()</a> - 返回数组中部分的或所有的键名</span></li>
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<li class="member"><span class="function"><a href="array_reverse.html" class="function" rel="rdfs-seeAlso">array_reverse()</a> - 返回单元顺序相反的数组</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> |