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138 lines
7.2 KiB
HTML
138 lines
7.2 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>返回数组中部分的或所有的键名</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-keys" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_keys</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_keys</span> — <span class="dc-title">返回数组中部分的或所有的键名</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-keys-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_keys</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$search_value</code><span class="initializer"> = null</span></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$strict</code><span class="initializer"> = false</span></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_keys()</strong></span> 返回 <code class="parameter">input</code>
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数组中的数字或者字符串的键名。
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</p>
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<p class="para">
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如果指定了可选参数 <code class="parameter">search_value</code>，则只返回该值的键名。否则
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<code class="parameter">input</code> 数组中的所有键名都会被返回。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-keys-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">input</code></dt>
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<dd>
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<p class="para">
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一个数组，包含了要返回的键。
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</p>
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</dd>
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<dt>
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<code class="parameter">search_value</code></dt>
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<dd>
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<p class="para">
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如果指定了这个参数，只有包含这些值的键才会返回。
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</p>
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</dd>
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<dt>
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<code class="parameter">strict</code></dt>
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<dd>
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<p class="para">
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判断在搜索的时候是否该使用严格的比较（===）。
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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-keys-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回 <code class="parameter">input</code> 里的所有键。 </p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-keys-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-6040">
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<p><strong>Example #1 <span class="function"><strong>array_keys()</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 />$array </span><span style="color: #007700">= array(</span><span style="color: #0000BB">0 </span><span style="color: #007700">=> </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #DD0000">"color" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<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">$array</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">$array </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">);<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">$array</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">$array </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"color" </span><span style="color: #007700">=> array(</span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">),<br /> </span><span style="color: #DD0000">"size" </span><span style="color: #007700">=> array(</span><span style="color: #DD0000">"small"</span><span style="color: #007700">, </span><span style="color: #DD0000">"medium"</span><span style="color: #007700">, </span><span style="color: #DD0000">"large"</span><span style="color: #007700">));<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">$array</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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[0] => 0
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[1] => color
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)
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Array
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(
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[0] => 0
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[1] => 3
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[2] => 4
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)
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Array
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(
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[0] => color
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[1] => size
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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-keys-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_combine.html" class="function" rel="rdfs-seeAlso">array_combine()</a> - 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值</span></li>
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<li class="member"><span class="function"><a href="array_key_exists.html" class="function" rel="rdfs-seeAlso">array_key_exists()</a> - 检查数组里是否有指定的键名或索引</span></li>
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<li class="member"><span class="function"><a href="array_search.html" class="function" rel="rdfs-seeAlso">array_search()</a> - 在数组中搜索给定的值，如果成功则返回首个相应的键名</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> |