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147 lines
8.4 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>使用键名比较计算数组的交集</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-intersect-key" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_intersect_key</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">array_intersect_key</span> — <span class="dc-title">使用键名比较计算数组的交集</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-intersect-key-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_intersect_key</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array1</code></span>
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, <span class="methodparam"><span class="type">array</span> <code class="parameter">$array2</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$...</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_intersect_key()</strong></span> 返回一个数组，该数组包含了所有出现在
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<code class="parameter">array1</code> 中并同时出现在所有其它参数数组中的键名的值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-intersect-key-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">array1</code></dt>
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<dd>
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<p class="para">
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The array with master keys to check.
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</p>
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</dd>
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<dt>
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<code class="parameter">array2</code></dt>
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<dd>
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<p class="para">
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An array to compare keys against.
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</p>
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</dd>
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<dt>
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<code class="parameter">...</code></dt>
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<dd>
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<p class="para">
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A variable list of arrays to compare.
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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-intersect-key-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns an associative array containing all the entries of
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<code class="parameter">array1</code> which have keys that are present in all
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arguments.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-intersect-key-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-6033">
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<p><strong>Example #1 <span class="function"><strong>array_intersect_key()</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 />$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'blue' </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'red' </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">'green' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">'purple' </span><span style="color: #007700">=> </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'green' </span><span style="color: #007700">=> </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'blue' </span><span style="color: #007700">=> </span><span style="color: #0000BB">6</span><span style="color: #007700">, </span><span style="color: #DD0000">'yellow' </span><span style="color: #007700">=> </span><span style="color: #0000BB">7</span><span style="color: #007700">, </span><span style="color: #DD0000">'cyan' </span><span style="color: #007700">=> </span><span style="color: #0000BB">8</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">array_intersect_key</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</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(2) {
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["blue"]=>
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int(1)
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["green"]=>
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int(3)
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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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上例中可以看到只有 <em>'blue'</em>
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和 <em>'green'</em> 两个键名出现在两个数组中，因此被返回。此外注意
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<em>'blue'</em> 和 <em>'green'</em>
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的值在两个数组中是不同的。但因为只检查键名，因此还是匹配。返回的值只是
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<code class="parameter">array1</code> 中的。
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</p>
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<p class="para">
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在 <em>key => value</em> 对中的两个键名仅在
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<em>(string) $key1 === (string) $key2 </em>
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时被认为相等。换句话说，执行的是严格类型检查，因此字符串的表达必须完全一样。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.array-intersect-key-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_diff.html" class="function" rel="rdfs-seeAlso">array_diff()</a> - 计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_udiff.html" class="function" rel="rdfs-seeAlso">array_udiff()</a> - 用回调函数比较数据来计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_diff_assoc.html" class="function" rel="rdfs-seeAlso">array_diff_assoc()</a> - 带索引检查计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_diff_uassoc.html" class="function" rel="rdfs-seeAlso">array_diff_uassoc()</a> - 用用户提供的回调函数做索引检查来计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_udiff_assoc.html" class="function" rel="rdfs-seeAlso">array_udiff_assoc()</a> - 带索引检查计算数组的差集，用回调函数比较数据</span></li>
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<li class="member"><span class="function"><a href="array_udiff_uassoc.html" class="function" rel="rdfs-seeAlso">array_udiff_uassoc()</a> - 带索引检查计算数组的差集，用回调函数比较数据和索引</span></li>
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<li class="member"><span class="function"><a href="array_diff_key.html" class="function" rel="rdfs-seeAlso">array_diff_key()</a> - 使用键名比较计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_diff_ukey.html" class="function" rel="rdfs-seeAlso">array_diff_ukey()</a> - 用回调函数对键名比较计算数组的差集</span></li>
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<li class="member"><span class="function"><a href="array_intersect.html" class="function" rel="rdfs-seeAlso">array_intersect()</a> - 计算数组的交集</span></li>
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<li class="member"><span class="function"><a href="array_intersect_assoc.html" class="function" rel="rdfs-seeAlso">array_intersect_assoc()</a> - 带索引检查计算数组的交集</span></li>
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<li class="member"><span class="function"><a href="array_intersect_uassoc.html" class="function" rel="rdfs-seeAlso">array_intersect_uassoc()</a> - 带索引检查计算数组的交集，用回调函数比较索引</span></li>
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<li class="member"><span class="function"><a href="array_intersect_ukey.html" class="function" rel="rdfs-seeAlso">array_intersect_ukey()</a> - 用回调函数比较键名来计算数组的交集</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> |