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140 lines
5.2 KiB
HTML
140 lines
5.2 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>在数组开头插入一个或多个单元</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-unshift" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_unshift</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_unshift</span> — <span class="dc-title">
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在数组开头插入一个或多个单元
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-unshift-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_unshift</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$array</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$...</code></span>
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] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>array_unshift()</strong></span> 将传入的单元插入到
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<code class="parameter">array</code> 数组的开头。注意单元是作为整体被插入的，因此传入单元将保持同样的顺序。所有的数值键名将修改为从零开始重新计数，所有的文字键名保持不变。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-unshift-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">...</code></dt>
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<dd>
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<p class="para">
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插入的变量。
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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-unshift-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">array</code> 数组新的单元数目。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.array-unshift-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>7.3.0</td>
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<td>
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现在可以只用一个参数来调用，之前至少需要两个参数。
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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-unshift-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-6079">
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<p><strong>Example #1 <span class="function"><strong>array_unshift()</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 />$queue </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"orange"</span><span style="color: #007700">, </span><span style="color: #DD0000">"banana"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_unshift</span><span style="color: #007700">(</span><span style="color: #0000BB">$queue</span><span style="color: #007700">, </span><span style="color: #DD0000">"apple"</span><span style="color: #007700">, </span><span style="color: #DD0000">"raspberry"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$queue</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] => apple
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[1] => raspberry
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[2] => orange
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[3] => banana
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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-unshift-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_shift.html" class="function" rel="rdfs-seeAlso">array_shift()</a> - 将数组开头的单元移出数组</span></li>
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<li class="member"><span class="function"><a href="array_push.html" class="function" rel="rdfs-seeAlso">array_push()</a> - 将一个或多个单元压入数组的末尾（入栈）</span></li>
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<li class="member"><span class="function"><a href="array_pop.html" class="function" rel="rdfs-seeAlso">array_pop()</a> - 弹出数组最后一个单元（出栈）</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> |