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145 lines
6.2 KiB
HTML
145 lines
6.2 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>计算数组的差集</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-diff" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_diff</h1>
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<p class="verinfo">(PHP 4 >= 4.0.1, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_diff</span> — <span class="dc-title">计算数组的差集</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-diff-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_diff</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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对比 <code class="parameter">array1</code> 和其他一个或者多个数组，返回在
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<code class="parameter">array1</code> 中但是不在其他 array 里的值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-diff-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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要被对比的数组
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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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和这个数组进行比较
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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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更多相比较的数组
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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-diff-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回一个数组，该数组包括了所有在
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<code class="parameter">array1</code> 中但是不在任何其它参数数组中的值。注意键名保留不变。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-diff-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="function.array-change-key-case.example-1">
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<p><strong>Example #1 <span class="function"><strong>array_diff()</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">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_diff</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 /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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在 <var class="varname"><var class="varname">$array1</var></var> 中多次出现的值一样处理，输出结果为：
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</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] => blue
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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 notes" id="refsect1-function.array-diff-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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两个单元仅在 <em>(string) $elem1 === (string) $elem2</em>
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时被认为是相同的。也就是说，当字符串的表达是一样的时候。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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注意本函数只检查了多维数组中的一维。当然可以用
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<em>array_diff($array1[0], $array2[0]);</em>
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检查更深的维度。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.array-diff-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_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_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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</ul>
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</p>
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</div>
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</div></div></div></body></html> |