mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 13:57:03 +08:00
173 lines
16 KiB
HTML
173 lines
16 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
<html>
|
||
<head>
|
||
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
||
<title>去掉数组中的某一部分并用其它值取代</title>
|
||
</head>
|
||
<body class="docs"><div id="layout">
|
||
<div id="layout-content"><div id="function.array-splice" class="refentry">
|
||
<div class="refnamediv">
|
||
<h1 class="refname">array_splice</h1>
|
||
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_splice</span> — <span class="dc-title">
|
||
去掉数组中的某一部分并用其它值取代
|
||
</span></p>
|
||
|
||
</div>
|
||
<div class="refsect1 description" id="refsect1-function.array-splice-description">
|
||
<h3 class="title">说明</h3>
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>array_splice</strong></span>
|
||
( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$input</code></span>
|
||
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
|
||
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = count($input)</span></span>
|
||
[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$replacement</code><span class="initializer"> = array()</span></span>
|
||
]] ) : <span class="type">array</span></div>
|
||
|
||
<p class="para rdfs-comment">
|
||
把 <code class="parameter">input</code> 数组中由
|
||
<code class="parameter">offset</code> 和 <code class="parameter">length</code>
|
||
指定的单元去掉，如果提供了 <code class="parameter">replacement</code> 参数，则用其中的单元取代。
|
||
</p>
|
||
<p class="para">
|
||
注意
|
||
<code class="parameter">input</code> 中的数字键名不被保留。
|
||
</p>
|
||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||
<span class="simpara">
|
||
如果 <code class="parameter">replacement</code> 不是数组，会被
|
||
<a href="language.types.array.html#language.types.array.casting" class="link">类型转换</a>
|
||
成数组 (例如： <code class="code">(array) $replacement</code>)。
|
||
当传入的 <code class="parameter">replacement</code> 是个对象或者 <strong><code>NULL</code></strong>，会导致未知的行为出现。
|
||
</span>
|
||
</p></blockquote>
|
||
</div>
|
||
|
||
<div class="refsect1 parameters" id="refsect1-function.array-splice-parameters">
|
||
<h3 class="title">参数</h3>
|
||
<p class="para">
|
||
<dl>
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">input</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
输入的数组。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">offset</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
如果 <code class="parameter">offset</code> 为正，则从 <code class="parameter">input</code>
|
||
数组中该值指定的偏移量开始移除。如果 <code class="parameter">offset</code>
|
||
为负，则从 <code class="parameter">input</code> 末尾倒数该值指定的偏移量开始移除。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">length</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
如果省略 <code class="parameter">length</code>，则移除数组中从 <code class="parameter">offset</code>
|
||
到结尾的所有部分。如果指定了 <code class="parameter">length</code>
|
||
并且为正值，则移除这么多单元。如果指定了 <code class="parameter">length</code>
|
||
并且为负值，则移除从 <code class="parameter">offset</code> 到数组末尾倒数
|
||
<code class="parameter">length</code> 为止中间所有的单元。
|
||
如果设置了 <code class="parameter">length</code> 为零，不会移除单元。
|
||
小窍门：当给出了
|
||
<code class="parameter">replacement</code> 时要移除从 <code class="parameter">offset</code>
|
||
到数组末尾所有单元时，用 <em>count($input)</em> 作为 <code class="parameter">length</code>。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">replacement</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
如果给出了 <code class="parameter">replacement</code> 数组，则被移除的单元被此数组中的单元替代。
|
||
</p>
|
||
<p class="para">
|
||
如果
|
||
<code class="parameter">offset</code> 和 <code class="parameter">length</code>
|
||
的组合结果是不会移除任何值，则 <code class="parameter">replacement</code>
|
||
数组中的单元将被插入到 <code class="parameter">offset</code>
|
||
指定的位置。 注意替换数组中的键名不保留。
|
||
</p>
|
||
<p class="para">
|
||
如果用来替换 <code class="parameter">replacement</code> 只有一个单元，那么不需要给它加上
|
||
<em>array()</em>，除非该单元本身就是一个数组、一个对象或者 <strong><code>NULL</code></strong>。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
</dl>
|
||
|
||
</p>
|
||
</div>
|
||
|
||
<div class="refsect1 returnvalues" id="refsect1-function.array-splice-returnvalues">
|
||
<h3 class="title">返回值</h3>
|
||
<p class="para">
|
||
返回一个包含有被移除单元的数组。
|
||
</p>
|
||
</div>
|
||
|
||
<div class="refsect1 examples" id="refsect1-function.array-splice-examples">
|
||
<h3 class="title">范例</h3>
|
||
<p class="para">
|
||
<div class="example" id="example-6067">
|
||
<p><strong>Example #1 <span class="function"><strong>array_splice()</strong></span> 例子</strong></p>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "green")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</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">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "yellow")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</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">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">), </span><span style="color: #DD0000">"orange"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "orange")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</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">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, array(</span><span style="color: #DD0000">"black"</span><span style="color: #007700">, </span><span style="color: #DD0000">"maroon"</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">// $input is now array("red", "green",<br />// "blue", "black", "maroon")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</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">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">"purple"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "green",<br />// "blue", "purple", "yellow");<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
</p>
|
||
<p class="para">
|
||
<div class="example" id="example-6068">
|
||
<p><strong>Example #2 <span class="function"><strong>array_splice()</strong></span> 例子</strong></p>
|
||
<div class="example-contents"><p>
|
||
以下表达式以同样方式修改了 <var class="varname"><var class="varname">$input</var></var>：
|
||
</p></div>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// 添加两个新元素到 $input<br /></span><span style="color: #0000BB">array_push</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">), </span><span style="color: #0000BB">0</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// 移除 $input 中的最后一个元素<br /></span><span style="color: #0000BB">array_pop</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 移除 $input 中第一个元素<br /></span><span style="color: #0000BB">array_shift</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 在 $input 的开头插入一个元素<br /></span><span style="color: #0000BB">array_unshift</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// 在 $input 的索引 $x 处替换值<br /></span><span style="color: #0000BB">$input</span><span style="color: #007700">[</span><span style="color: #0000BB">$x</span><span style="color: #007700">] = </span><span style="color: #0000BB">$y</span><span style="color: #007700">; </span><span style="color: #FF8000">// 对于键名和偏移量等值的数组<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
</p>
|
||
</div>
|
||
|
||
<div class="refsect1 seealso" id="refsect1-function.array-splice-seealso">
|
||
<h3 class="title">参见</h3>
|
||
<p class="para">
|
||
<ul class="simplelist">
|
||
<li class="member"><span class="function"><a href="array_slice.html" class="function" rel="rdfs-seeAlso">array_slice()</a> - 从数组中取出一段</span></li>
|
||
<li class="member"><span class="function"><a href="unset.html" class="function" rel="rdfs-seeAlso">unset()</a> - 释放给定的变量</span></li>
|
||
<li class="member"><span class="function"><a href="array_merge.html" class="function" rel="rdfs-seeAlso">array_merge()</a> - 合并一个或多个数组</span></li>
|
||
</ul>
|
||
</p>
|
||
</div>
|
||
|
||
</div></div></div></body></html> |