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208 lines
8.5 KiB
HTML
208 lines
8.5 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>移除数组中重复的值</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-unique" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_unique</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_unique</span> — <span class="dc-title">移除数组中重复的值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-unique-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_unique</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$sort_flags</code><span class="initializer"> = SORT_STRING</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_unique()</strong></span> 接受
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<code class="parameter">array</code> 作为输入并返回没有重复值的新数组。
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</p>
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<p class="para">
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注意键名保留不变。<span class="function"><strong>array_unique()</strong></span>
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先将值作为字符串排序，然后对每个值只保留第一个遇到的键名，接着忽略所有后面的键名。这并不意味着在未排序的
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<code class="parameter">array</code> 中同一个值的第一个出现的键名会被保留。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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当且仅当
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<em>(string) $elem1 === (string) $elem2</em> 时两个单元被认为相同。
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例如，字符串表达一样时，会使用首个元素。
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</span>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-unique-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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输入的数组。
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</p>
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</dd>
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<dt>
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<code class="parameter">sort_flags</code></dt>
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<dd>
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<p class="para">
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第二个可选参数<code class="parameter">sort_flags</code> 可用于修改排序行为：
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</p>
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<p class="para">
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排序类型标记：
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara"><strong><code>SORT_REGULAR</code></strong> - 按照通常方法比较（不修改类型）</span>
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</li>
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<li class="listitem">
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<span class="simpara"><strong><code>SORT_NUMERIC</code></strong> - 按照数字形式比较</span>
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</li>
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<li class="listitem">
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<span class="simpara"><strong><code>SORT_STRING</code></strong> - 按照字符串形式比较</span>
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</li>
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<li class="listitem">
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<span class="simpara"><strong><code>SORT_LOCALE_STRING</code></strong> - 根据当前的本地化设置，按照字符串比较。
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</span>
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</li>
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</ul>
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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-unique-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回过滤后的数组。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.array-unique-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.2.10</td>
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<td>
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修改回 <code class="parameter">sort_flags</code> 的默认值为
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<strong><code>SORT_STRING</code></strong>。
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</td>
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</tr>
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<tr>
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<td>5.2.9</td>
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<td>
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增加可选选项<code class="parameter">sort_flags</code>，默认值 <strong><code>SORT_REGULAR</code></strong>。
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5.2.9 之前，此函数内部使用 <strong><code>SORT_STRING</code></strong> 排序。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-unique-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-6077">
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<p><strong>Example #1 <span class="function"><strong>array_unique()</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">"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">"b" </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">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_unique</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Array
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(
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[a] => green
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[0] => red
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[1] => blue
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)
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-6078">
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<p><strong>Example #2 <span class="function"><strong>array_unique()</strong></span> 和类型</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= array(</span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #DD0000">"4"</span><span style="color: #007700">, </span><span style="color: #DD0000">"3"</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">"3"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_unique</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</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>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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[0] => int(4)
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[2] => string(1) "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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</div>
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<div class="refsect1 seealso" id="refsect1-function.array-unique-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_count_values.html" class="function" rel="rdfs-seeAlso">array_count_values()</a> - 统计数组中所有的值</span></li>
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</ul>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.array-unique-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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<span class="simpara">
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注意， <span class="function"><strong>array_unique()</strong></span> 不能应用于多维数组。
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</span>
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</p></blockquote>
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</div>
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</div></div></div></body></html> |